concurrency explained with a joke!

This isn’t about a train… this is about concurrency.. and in that sense it isn’t funny at all! because the “civilized” world called “the West” under command of the USG and all her Western vassal states promote this as the new way of developing things… with the JSF, LCS and many other great examples of how not to engineer things… but because they have the marketingtools and the US Congress on their side.. they keep on going… on the same track! so much for smart thinking and smart buying.

Watch this movie: Wonderful Engineering


“The overlap of development with production and operations results in the need to manage a concurrency program and conduct retrofits on jets with life-limited parts or impacts to capabilities. For the F-35 program, concurrency phases out with the completion of SDD. Block 3i DT&E full Certification is planned by 3rd Qtr FY15, and Block 3F DT&E full Certification is planned by 4th Qtr FY17.”

life-limited parts or impacts to capabilities: this means… a costly retrofit…. or downgrade the capabilities of the JSF aircraft.. Both have happened many times. still the RNLAF (and many other)  guys keep on promising mountains of improved capabilities versus 4th generation aircraft. Totally ridiculous isn’t it? but our politicians eat it like sweet cake.

(you can scroll down the list… and this isn’t all, since this report there have been new issues, and there will come a lot more…..and some of the issues are military secrets so aren’t counted in this list. All because of the amazing concurrency..trying to fix a bug in production!

Now look at what this leads to…. in the case of the JSF!

Total cost of corrections to upgrade Block 1, 2 to Block 3 standard US AIR FORCE only (F-35A): US$ 1.389.388 between FY2013 and FY2020

Total cost of corrections due to concurrency US AIR FORCE only (F-35A) : US$ 1.296.458  between FY2013 and FY2020

Source: US DOD, JSF Program Office.  (page 207-212)

One wouldn’t believe, when you couldn’t read it in an official document, 240 items highest priority only (so, what lower priority items there are????)


This effort (MN-F3516) funds retrofits due to concurrency changes to correct deficiencies discovered after DD-250 of the last aircraft in a given Low Rate Initial Production (LRIP) lot. This includes modifications required to extend aircraft service life currently limited by low-life parts, and relieve capability limitations driven by concurrency of production with development. The concurrency funding line will procure the highest priority modifications from the Tri-Service Modification Prioritization List, as soon as they become supportable from an engineering, production, and installation standpoint. The list is vetted by the Services  and Partners every 6 months to ensure the list accurately reflects existing requirements as well as emerging issues. Per-kit costs will vary for each modification being implemented, and in some cases will also vary for aircraft from different LRIP lots to implement an individual modification. For FY16, the highest priority modifications will directly support USAF IOC, Block 3i, and tactics development. The following modifications will be the highest priorities for accomplishment throughout the F-35A CTOL fleet using funds from this Budget Activity.

TI Number Mod CR Title

TI-0000-1089 CR-021694 LRIP 3 Aux Air Inlet (AAI) Door Install

TI-0000-1324 CR-022656 Structural Cracking of Aft MLG Door Drive Link U-Joint

TI-0000-0116 CR-011738B Full Qualified Clutch Cooling Fan

TI-0000-0367 CR-014114C Engine Trailer Adapter Kit – FS556 Interface, J27006/J27007

TI-0000-0121 CR-014289B Lift Fan Exhaust/Inboard Weapon Bay Door Interference

TI-0000-0396 CR-014289C WBDD Limit Life, ECU

TI-0000-0655 CR-014819D EO DAS Center Fuselage Vibration Testing

TI-0000-0373 CR-015026B Aux Air Inlet Lock Actuation Mechanism

TI-0000-0423 CR-016270C Bleed Air System Ducting Design

TI-0000-0099 CR-017502 J75503 Wrap Around Adapter Set

TI-0000-0683 CR-017534&B Rev-HT Bearing Issues

TI-0000-0463 CR-017913B Support-Fairing, Mid, LH/RH

TI-0000-0058 CR-018274 Back-Up Radio Tray Clearance

TI-0000-0968 CR-018524 Material Removal Allowance for IPP Blocker and Screen

TI-0000-0027 CR-018524A IPP Exhaust (STOVL)

TI-0000-0138 CR-018564B Wingtip Light Improvement For FAA Compliance

TI-0000-0825 CR-022768D LEF Improvements

TI-0000-0031 CR-018835 Nose Wheel Steering (NWS) Motor

TI-0000-0015 CR-018836 Stress Failure of Hydraulic Tube Support Bracket

TI-0000-0063 CR-018838A Bootstrap Accumulator Redesign

TI-0000-0045 CR-019003 CTOL/STOVL MLG SDD & LRIP Part Number Rolls

TI-0000-0056 CR-019004B IPP Controller Part Number Roll

TI-0000-0057 CR-019005 STOVL GO3 Control Valve Part Number Roll

TI-0000-0117 CR-019107 CTOL Trestle Inst Cotter Pin

TI-0000-0165 CR-019135B R3 Float Valve with Mechanical Thread Locking

TI-0000-0231 CR-019340B PTMS EHA Cooling Orifices – CTOL & STOVL

TI-0000-0101 CR-023102A Lift Fan Inlet Door Full Qualification Part Number Roll

TI-0000-0245 CR-019469C Antenna Switch Unit

TI-0000-0264 CR-019516A PTMS Controller

TI-0000-0124 CR-019533 Controller, Motor Pump Qual Failure (GMMP)

TI-0000-0561 CR-019683E STOVL FS 496 Bulkhead Trunnion

TI-0000-0280 CR-019841 Cockpit Panels Pushbutton Switch Simultaneity

TI-0000-0398 CR-019930C Arresting Hook Aft Door Spring Damper Part Number Roll

TI-0000-0375 CR-019979 STOVL IRCM Doors Bushing to Lug Interference

TI-0000-0208 CR-020003A CTOL Arresting Gear Push Rods

TI-0000-0424 CR-020066A Firewall Shutoff Valve Part Number Roll

TI-0000-0477 CR-020097A CTOL EHAS Panels

TI-0000-0875 CR-020189 CV Main Landing Gear Retract Actuator

TI-0000-0130 CR-020289 Emergency Control Valve Qual Failure

TI-0000-0575 CR-020289A ULF & 3BSD Emergency Control Valve

TI-0000-0608 CR-020396D Fwd Upper Engine Mount (CTOL)

TI-0000-0456 CR-020396D Bulkhead – FS 450

TI-0000-0457 CR-020396D Bulkhead – FS 472

TI-0000-0458 CR-020396D Bulkhead – FS 518 (Upper)

TI-0000-0460 CR-020396D Bulkhead – FS 556

TI-0000-0432 CR-020397A Short Life – CTOL Wing Forward Root Rib

TI-0000-0602 CR-020398A Brake Control Unit (BCU)

TI-0000-0538 CR-020593 EHA Flaperon Support Equipment Locations

TI-0000-0363 CR-020636A TRS Component Changes from Qual Test Failures

TI-0000-0412 CR-020680B Wing Lighting Controller Salt Fog Failure

TI-0000-0331 CR-020725 WBDDS RGAs Limited Life – Change Request Approval

TI-0000-0654 CR-020726A IDMS Connector Ref Des Swap

TI-0000-0673 CR-020743B Ordnance Quick Latch System (OQLS) Clip Lock

TI-0000-0137 CR-020793 Pump, Motor GND Maint Qual Failure

TI-0000-0132 CR-020907B Valve, Mechanical Sequence – T Qual Failure

TI-0000-0811 CR-021167A 2WSH54239: CV Rear Spar

TI-0000-0810 CR-021168 2WSH64241: CV Frame

TI-0000-0817 CR-021170 2WSH44162: CV RH Tail Hook Longeron

TI-0000-0631 CR-021180 Countermeasures Doors & NNMSB/WSESRB Concerns

TI-0000-0263 CR-021181 Power Panel 1, 2, 3

TI-0000-0544 CR-021194 Limited Life STOVL Mid Fairing Longeron

TI-0000-0558 CR-021194 Short Life Parts: Keel Beam RH

TI-0000-0559 CR-021194 Short Life Parts: NLG Drag Brace Ftg

TI-0000-0566 CR-021194 Short Life Parts: Support, Otbd, FS 502.65 LH/RH

TI-0000-0617 CR-021194 Limited Life STOVL STA 3/9 Aft Rib

TI-0000-0545 CR-021217 Limited Life STOVL Nacelle Vent Inlet

TI-0000-0564 CR-021217 STOVL Forward Root Rib (L6/U6)

TI-0000-0808 CR-021259 Weapons Bay Door Uplock Sealing

TI-0000-0098 CR-022768D CTOL Nose Landing Gear

TI-0000-0910 CR-021395A PCD EU Cooling Rework

TI-0000-0607 CR-021434 Limited Life CTOL STA 3/9 Aft Rib

TI-0000-0135 CR-021459B Engine Driven Pump Life Limit

TI-0000-0895 CR-021557A Arm Disable Current Leakage Path Correction

TI-0000-0848 CR-021621 2CSH20930 Splice, Fuel Floor/Root Rib, FS 402, RHS/LHS

TI-0000-0377 CR-021694 Aux Air Inlet Door Redesign

TI-0000-0845 CR-021891 CV VT Aft Moment Fitting Life Limited Structures Part

TI-0000-0626 CR-021905A SMSFRIU SDD/LRIP Arm Disable Input

TI-0000-0998 CR-021915B CTOL and CV Refuel System Mod

TI-0000-0897 CR-022058 Roll Control Nozzle Door Redesign

TI-0000-0495 CR-022105F OBIGGS & Pressure/Vent Changes for Lightning Protection

TI-0000-0133 CR-022196A Filter Module, Pressure Qual Failure

TI-0000-1011 CR-022226A L-Band Pre-Selector (LBPS) Calibration for Mode 5

TI-0000-0802 CR-022695 CTOL Main Landing Gear

TI-0000-0703 CR-022515A Roll Post Door Actuator Life Limitation

TI-0000-1101 CR-022647A GMMP Controller EEE outage

TI-0000-1092 CR-022666 Landing Taxi Light Redesign

TI-0000-0119 CR-022736 MWARS Replacement

TI-0000-0866 TBD Production Ejection Seat (-0023)

TI-0000-1099 CR-022841B ATQA Mounting Bolt Interface

TI-0000-0064 CR-022872 Counter Measures Door Control Valve on AF:6

TI-0000-0158 CR-022877 WBDD Flexible Cable Re-design

TI-0000-0191 CR-024623 270V BCCU

TI-0000-0574 CR-023121B/D Electronics Units Modifications

TI-0000-1485 CR-023282CA F1 Feed Tank Gasket

TI-0000-1540 CR-023332A CV Rudder Hinge 2

TI-0000-1372 CR-023355D EW Block-2 DRFM Module Firmware Issue

TI-0000-1652 CR-023599 Rudder Slider Hinge Wear

TI-0000-1654 CR-023712 CV Right Hand (RH) Center Fuselage Avionics Bay Floor

TI-0000-2548 CR-023712 CV Center Fuselage FS 402 Outboard Joint Limited Life

TI-0000-2551 CR-024031 L-Band Power Amplifier (LBPA) Update for LINK-16

TI-0000-1709 CR-024114 Carrier Variant Marker Beacon Antenna

TI-0000-2513 CR-024153 CV IPP Shear Web Limited Life

TI-0000-1207 CR-024162 Vehicle Management Computer (VMC) Electrical Connection Issue

TI-0000-0441 CR-20773A CTOL FS 594 Centre Arch Low Life

TI-0000-1549 CR-023540A Firmware Update for AMS Cartridge Reset SPAR

TI-0000-0405 CR-23769 EDU Random Vibration Failures

TI-0000-0702 CR-24090 CV Fwd Arresting Gear Door Actuator Life Limitation

TI-0000-2554 CR-24872 J84001 Fiber Optic Inspection Set Extension Handle DR?s

TI-0000-0122 TBD 28V Battery and Charger Changes

TI-0000-0129 TBD MLG Control Valve Part Number Roll

TI-0000-0709 CR-022768D HT EHA Block Change for LRIP 4

TI-0000-0282 TBD Update to Audio Control Electronics (ACE) Unit

TI-0000-0469 TBD Composite BOS 2ZCH42000-0002 Assemblies

TI-0000-0583 TBD CTOL/STOVL Rudder EHA Design Change

TI-0000-0906 TBD NLG Lug Inspection and Support Stiffener

TI-0000-1097 CR-022972 Ball Joint Salt Fog Failure

TI-0000-0913 TBD LEFAS PDU Resolver and Rotor Shaft Seal Life

TI-0000-1113 CR-024000 AESG Power Connector Rating (Generator)

TI-0000-1256 TBD CV Nose Landing Gear Drag Brace Door Cracking

TI-0000-1396 TBD HTCA with End Gland Material Issue

TI-0000-0336 CR-024982 Panoramic Cockpit Display (PCD) Major Variances – DU

TI-0000-0343 CR-024982 Panoramic Cockpit Display (PCD) Major Variances – EU

TI-0000-0480 CR-025000 ICC Qual Issues

TI-0000-2784 TBD CNI 3A & 3B Integrated Backplane Assembly (IBA) Upgrades

TI-0000-0221 TBD DAS Refuel Lights Lenses

TI-0000-0406 CR-025271 Ordnance Hoist System (OHS) Hoist

TI-0000-1102 CR-022481B BH-1 Weapons Bay Doors

TI-0000-1472 TBD Gun Port Door Threads in Bearing Issue

TI-0000-0329 CR-021982 Refueling Bay and Nozzle Clash LRIP 1-3 Modification

TI-0000-0781 CR-023432 3BSM NBD – Assembly Changes

TI-0000-1446 TBD CV Fuel Dump

TI-0000-0908 CR-023802 STOVL Fuel Dump (CCDD LRIP2-051)

TI-0000-1000 CR-022481 Inboard Weapon Bay Door Flipper Door Design Change

TI-0000-1060 CR-022121 Final Finishes

TI-0000-1078 CR-025006 AF1 Nacelle Insulation

TI-0000-0180 TBD CTOL Fuel Floor Tooling Holes – Bay 207 to Gun Bay

TI-0000-0787 CR-024068 HMDS Path Forward

TI-0000-1048 CR-023982 Panoramic Cockpit Display-Electronic Unit (PCD-EU)

TI-0000-1062 TBD CV Main Landing Gear

TI-0000-1063 TBD CV Nose Landing Gear

TI-0000-0284 TBD STOVL Canopy frame

TI-0000-0316 TBD CTOL FS 496 Bulkhead Trunnion

TI-0000-0321 TBD Lift Fan Exhaust Door Aft Uplock Hook Failure

TI-0000-0467 TBD Fuel Floor – FS496-556, LH

TI-0000-0468 TBD Fuel Floor – FS496-556, RH

TI-0000-0486 TBD Short Life – STOVL Inner Wing FS518 Lower Bulkhead

TI-0000-0543 TBD Path Forward for Outboard Rib at Station 2 and 10

TI-0000-0556 TBD STOVL Short Life Parts: Aft Mid Keel

TI-0000-0638 TBD STOVL BL 0.0 Web Fwd Upper Engine Mount Support

TI-0000-0813 TBD CV Life Limited Structures Part – LH/RH Pylon Sta 3 Aft Rib

TI-0000-0815 TBD 2WSH24212 CV FWD Upper Engine Mount

TI-0000-0816 TBD 2WSH34496 – CV FS 496 Blkhd Station 6

TI-0000-1440 TBD STOVL Thrust Mount Shear Webs

TI-0000-0723 TBD EOTS PBS Startup Timeline

TI-0000-0055 CR-019070 IPP Bay Vent Fan Electrical Bond

TI-0000-0281 CR-020226 Hoist Point Cover FIP Proposal

TI-0000-1023 CR-022936 Roll Nozzle and Duct Bay – BALD Sensors redesign

TI-0000-0193 CR-021921B EW Gain State Control Logic Error

TI-0000-1365 CR-022721A Cat Launch Shock Exceeds INS PBS

TI-0000-0448 TBD Add -0007 ASSCA/-0006 ATQA To Aircraft TVE

TI-0000-0842 TBD 2ESH10095 CV HT Rib 5 Life Limited Structures Part

TI-0000-0976 TBD BF6 and BF8 RCS ATP

TI-0000-0819 TBD Liquid Cooling System Cart – Facility AC Power Interface

TI-0000-1134 TBD Cabin Pressure Tester

TI-0000-1198 TBD HT Heating

TI-0000-0361 CR-023382 Vertical Tail 575 Fitting

TI-0000-0386 CR-025191 Fuel System Major Variance for LRIP 1-Signal Amplifier

TI-0000-0516 CR-022972 AAR Probe Weak Link Adaptor Re-design

TI-0000-0576 CR-020289A Refuel Probe/Tailhook Emergency Control Valve

TI-0000-0578 CR-020289A Aux Inlet Door Emergency Control Valve

TI-0000-1082 TBD Power Panel 1 & 2 Random Vibration Failures

TI-0000-1203 CR-021217 Life Limited 402 Frame

TI-0000-1289 CR022737 US16E Ejection Seat/MWARS Retrofit Configuration Proposal

TI-0000-1421 TBD STOVL Main Landing Gear

TI-0000-1422 CR-021388A STOVL Nose Landing Gear

TI-0000-1483 TBD Power Panel 3 Random Vibration Failures – Second Failure

TI-0000-1486 CR-023838 STOVL FS 503 Frame/IPP Shear Web Durability Test Failure

TI-0000-1515 CR-024000 ESG Service Life (Generator) -0003

TI-0000-1551 TBD 28V Battery Full Qualification

TI-0000-1589 CR-023300 Hydraulic System Single Point Failure

TI-0000-1786 CR-023729 FS-402 Frame (TIN-075)

TI-0000-1857 TBD 2GHH42033 Time Delay Valve – Fully Qualified Part

TI-0000-2467 CR-025204 CTOL FS 503 Frame Limited Life

TI-0000-2468 CR-025204 CTOL IPP Shear Web Limited Life Discovery

TI-0000-2641 CR-024341 STOVL – Short Shank Condition, Engine Access Panel

TI-0000-2674 CR-24794 Cracking of Bifurcation Seam Treatment

TI-0000-2892 CR-025079 BF5 IRCM Hinge to Drive Link Clash

TI-0000-1552 TBD 28V BCCU Lightning Compliance

TI-0000-2682 TBD AR Probe Light

TI-0000-0884 CR-024000 AESG – Material & Workmanship

TI-0000-1142 TBD Missionized Gun System Jumper Panel Hoses and Drain Seal

TI-0000-1796 CR-025271 Ordnance Hoist System (OHS) Motor

TI-0000-2506 TBD Gun Port Blast Mislocation

TI-0000-2546 TBD Weapon bay light departing aircraft during flight

TI-0000-2833 TBD Gun System Muzzle and Purge Door Time Out

TI-0000-0387 CR-016910 Fuel System Major Variance for LRIP 1 – Dive Rate Performance

TI-0000-1161 CR-22656 STOVL Aft MLG Door Cracking

TI-0000-1518 CR-024193 PAO Cooling Orifices In Center Fuselage Cold Liquid Loop

TI-0000-1783 TBD Canopy Boot Cracking

TI-0000-2633 CR-024265 Flaperon Blade Seal Buckling

TI-0000-2672 TBD Radome Shroud Gapping/Trimming

TI-0000-2909 CR-025167 IPP Bay High Flow Air Duct Separation

TI-0000-2931 TBD CV NLG Drag Brace Cylinder and Steering Motor

TI-0000-0236 CR-019412 FPS Fire and Bleed Leak Controller (FBLC) Redesign

TI-0000-0260 CR-016633C Canopy Actuation System

TI-0000-0738 CR-025142 Modified Fuel Dump Valve (T28a)

TI-0000-0772 TBD PTMS Turbomachine/ACCM Cable Interface Changes

TI-0000-0327 TBD STOVL High Sea State Fuel Stowage – Rev B to CR-016712A

TI-0000-0737 TBD IPP Purge Issue Due to Low Fuel Shutdown

TI-0000-1650 CR-022737 MWARS for Production Seat

TI-0000-1653 CR-23490 Ground Maintainance Valve Deletion to Prevent PAO in Cockpit(DR 1-4815699)

TI-0000-2416 TBD CV Drag Strut – Alt Gear Extension

TI-0000-2450 CR-023901 Bleed Air Sensor Fitting Galling

TI-0000-2635 TBD CV NLG Interference Problems – OBOGs routing

TI-0000-2725 CR-024162 Vehicle Management Computer (VMC)

TI-0000-2834 CR-024904 Boarding Ladder Cracks

TI-0000-2889 TBD WBDDS Supplier Disclosure on Lower Breakaway Torque

TI-0000-0771 CR-16464B Install Battery into CNI Rack 3A and 3B

TI-0000-0945 TBD CTOL Audio Control Electronics (ACE) In-Flight Refueling

TI-0000-1056 CR-016660C RADAR 1A & 1B Racks -0002 Cut-in

TI-0000-2818 CR-025046 EOTS LoS Pointing Angle

TI-0000-1093 CR-023616 CV Arresting Gear

TI-0000-0358 TBD Production Ejection Seat (-0021)

TI-0000-0514 TBD Lift Fan Inlet Maintenance Fix

TI-0000-0579 TBD Auto Pilot

TI-0000-1520 TBD CV Nose Landing Gear Aircraft Integration

TI-0000-1761 TBD HT EHA Solenoid Valve (SOV) Qual Test Failure

TI-9999-0655 TBD EO DAS Center Fuselage Vibration Testing

TI-0000-0730 TBD CV Rudder EHA

TI-0000-0833 CR-021053 Short Shank Condition on Engine Inspection Panels

TI-0000-1122 TBD LEFAS Foldbox Lug Cracking

TI-0000-1192 TBD CTOL Thrust Mount Shear Web

TI-0000-1494 TBD PTMS Turbomachine Configuration to Correct Qualification Failures

TI-0000-1499 TBD FS 472 Bulkhead Crack BH-1

TI-0000-1541 TBD CV HT LOWER SKIN BOLTS SD-2013-010

TI-0000-1649 TBD CV LEFAS Asymmetry Brake Lug Cracking

TI-0000-1655 CR-024025 STOVL Right Hand(RH)and Left Hand(LH)Rear Spar Lower Flange Fatigue Cracks

TI-0000-2423 TBD CV Lower FS 518 Design Change

TI-0000-2448 CR-023966A CV Thrust Mount Shear Web – Service Life

TI-0000-2670 TBD Durability Findings 2013 – Bulkhead FS 496

TI-0000-2813 TBD Durability Findings – FS 450, 472, 556, 518 Lower and IRCM Fitting

TI-0000-2814 TBD Durability Findings 2013 – FS 575 Center Arch Frame

TI-0000-1104 TBD CTOL Ventilation Leakage from Bay 207L

TI-0000-0992 CR-013553 Outboard Vertical Tail Seal Redesign

TI-0000-0904 CR-021759 Backup Radio Guide Pin Misalignment

TI-0000-1053 CR-022138 Fire Suppression Bottle Low Clearance

TI-0000-2675 TBD Roll Nozzle Bay – BALD Sensors – Supplier Disclosure

TI-0000-2921 CR-025116 Gun Vent Door Unpainted Brackets

TI-0000-0485 TBD J12003 Ejection Seat Stand Design Issues

TI-0000-0660 TBD J26007 LF Driveshaft

TI-0000-0799 TBD Canopy Sling

TI-0000-1337 TBD DR 1-2076141 Tool Boxes not within weight standards

TI-0000-1338 TBD DR 1-2565051 Tool Set Shipboard FOD Hazard

TI-0000-1629 TBD Deployable Mission Rehearsal Trainer #1

TI-0000-1658 TBD Changes to Support Turning on AMC’s Algorithms in ALIS

TI-0000-2440 TBD J26035 Adapter, Drive Shaft Compression Galling issue

TI-0000-2699 CR-023093C Fibre Channel Switch Design Issues -0005

TI-0000-2797 TBD SE Weight Label and Forklift Provisions

TI-0000-2954 TBD STOVL NLG EEE Failure

TI-0000-1408 TBD AEL, Aft Sector

TI-0000-2865 TBD TR2 – SP-SPIO Issue

TI-7777-0004 CR-013644D MLG Strut Redesign

TI-7777-0007 CR-015718A OBOGS Plenum HEPA Filter Provisioning

TI-7777-0010 CR-016660B Radar Harness Redesign

TI-7777-0024 CR-018697 Gun Gas Purge & Gun Port Door Actuators

TI-7777-0031 CR-018544 Brake Control Electronic Unit Update

TI-7777-0042 CR-018487A Return Fuel Cooler HX Coating

TI-7777-0057 CR-018378 Nacelle Fan – Full Qualified Configuration

TI-7777-0077 CR-009382B Small Diameter Bomb (SDB) Rack Strut

TI-7777-0081 CR-014768E 270V BCCU Change

TI-7777-0083 TBD EHAS/LEFAS -0011 EU & Rack Config Update

TI-7777-0084 CR-016708A ACCM Filter Pin

TI-7777-0085 CR-016758A Replacement of Door Actuator Lock Assemblies

TI-7777-0087 CR-016909A Flaperon EHA Pump Design Change

TI-7777-0089 CR-017095 Avionics Bay Environmental Seal Change

TI-7777-0093 CR-017505 Flow Sensor EMI/Vibration

TI-7777-0095 CR-017773 Manual Drive Unit

TI-7777-0097 CR-017937A IEU Lightning Compliance

TI-7777-0098 TBD CTOL Structure Redesign for Updated Gun Loads

TI-7777-0101 CR-15956A NLG Down Lock Actuator

TI-7777-0102 CR-016633C Canopy Actuation System

TI-7777-0106 CR-016912 WBD Fwd Uplock Roller Bracket

Milestone/Development Status

DEVELOPMENT STATUS/MAJOR DEVELOPMENT MILESTONES For the F-35 program, the discovery of new concurrency changes phases out with the completion of SDD.

The United States Air Force F-35A Conventional Takeoff and Landing (CTOL) correction of deficiencies effort provides near and long term improvements to the fleet, focusing on documented  deficiencies related to safety, maintainability, and aircraft systems. These modifications and selected component changes are being accomplished by field and depot retrofit. In order to meet emerging deficiencies the airframe and integrated systems must be modified as critical corrections/changes are identified. Funds will be used to manage, prepare, process and incorporate concurrency changes to sustain and improve CTOL system operations. Concurrency changes are implemented to coincide with resources and aircraft availability.

Block upgrades provide more robust performance in navigation, weapons, avionics, survivability, maneuverability, maintainability, and mission deployment of the F-35A CTOL platform. This modification program will bring early production aircraft and integrated systems to a common fleet configuration as fielded capabilities evolve over the course of the F-35 program.

The requested modification funding enables several distinct efforts pertaining to the Air Force F-35A CTOL aircraft to include post DD-250 concurrency retrofits, block upgrades for F-35A CTOLs, and upgrading hardware and software components to a full Block 3F configuration. The focus of the modification funding requested in the 2015 President’s Budget is the first (concurrency) and third (Block 3i long-lead) efforts.


The overlap of development with production and operations results in the need to manage a concurrency program and conduct retrofits on jets with life-limited parts or impacts to capabilities. For the F-35 program, concurrency phases out with the completion of SDD. Block 3i DT&E full Certification is planned by 3rd Qtr FY15, and Block 3F DT&E full Certification is planned by 4th Qtr FY17.

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