TPE FCU Adjustment pictures

1. TPE 331 FCU Adjustment

Woodward Fuel Control PN’s
8698199,893561,897375,897770,897801
,897799,897800

2. Disclaimer

• The Fuel Control Adjustments depicted on these
slides are for reference ONLY. Please consult
appropriate Engine Maintenance Manual for specific
rates of adjustments.
• Generally the Flight Idle Fuel Flow is set by the OEM
Please consult the OEM Aircraft Maintenance
Manual or the AFM for proper adjustment.
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3. Top View of 869199-X FCU

Main Metering Valve
Adjustments. NO
adjustments allowed in
the field
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4. Back View of 869199-X FCU

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5. Overspeed adjustment of 869199-X FCU

Overspeed Governor
Adjustment
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6. Max PWR and FI Wf 869199-X FCU

Max PWR Adjustment
Intermediate/FI Adjustment
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7. Inside Back Cover 869199-X FCU

Max Pwr
Adjustment
Intermediate/
FI
Adjustment
T2 Bias
Adjustment
Acceleration
Adjustment
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8. Max Pwr Adjustment 869199-X FCU

Max PWR Adjustment
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9. Typical of PN 893561,897375,897770,897801 Woodward FCU Units

Under Speed Governor
Older OSG
adjustment
Specific Gravity Adjustment
Manual Fuel Valve
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10. Manual Fuel Valve & Underspeed Governor

Manual Fuel Valve & Underspeed Governor
Manual Fuel valve
Max Stop
Non Adjustable
Underspeed
Governor
Min Stop
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11. Specific Gravity Adjustment / Trim

Increase fuel CW
Decrease Fuel
CCW
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12. FCU Back Cover

Manual Fuel Valve
Under Speed Gov
Flight Idle wf
Max power
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13. Flight Idle adjustment and plug

Pay particular attention to this washer,
they have been know to come off the
spring
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14. Max Power Adjustment

Max power
Flight Idle wf
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15. Under Back cover

Manual Fuel Valve
Cam
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16. Under Back Cover

Max Power Adjustment
Flight Idle Fuel Flow
adjustment
MFV Cam
Follower lever
T2 Bias
adjustment
Acceleration Schedule
adjustment
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17. Start Acceleration Fuel Flow – Location

Start Acceleration Fuel
Flow Adjustment
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18. Start Acceleration Fuel Flow – Locking Screw

Remove Locking Screw 3/32
Allen wrench
Start Accel Adjustment 5/64
Allen wrench. Adjustment is
very tight
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19. Start Acceleration Fuel Flow – Locking Screw

Locking Screw in
Locking Screw Out
Must be removed for
adjustment
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20. Start Acceleration Fuel Flow – Locking Screw

Locking Screw
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21. Max Power and Flight Idle fuel

Max Power Adjustment
Flight Idle Fuel flow
adjustment
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22. Overspeed Gov Adjustment location

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23. Overspeed Governor Adjustment

Note: OSG Adjustment is under
/behind this bracket. Use tool
called out in EMM for adjustment.
Its also very tight
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24. T2 Bias Adjustment – Re-instate max power

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25. MFV Follower Arm Location – Correct

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26. MFV Follower Arm Location – Correct

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27. MFV Follower Arm Location – Incorrect

Should be here
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28. MFV Follower Arm Location – Incorrect

Should be here
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29. Adjustment Sequences

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30. Adjustment Rates

Acceleration Adjustment:
1 Turn = 60PPH CW Increase
USG Low:
1 Turn =5% CW Increase
USG High:
1 ture = 3% CCW Increase
Note: May effect Prop Governor High Setting
OSG Internal/External:
1 turn = 4.5% CW Increase
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31. Other Adjustment Rates

T2 Bias:
1 Turn = 80PPH CCW Increase.
Note EMM procedure
Flight Idle/Intermediate Fuel Flow:
1 turn = 150PPH CW Increases
1 Click = 2PPH
Max Power:
1 Turn = 20PPH CW Increase
8 Clicks per turn
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32. AD 2006-NE-03-AD

• Applicable SB’s
A 73-0271 For TPE331-1 & -2
A 73-0262 For TPE331-3, -5, -6 and some -10’s
A 73-0254 For TPE331-10, -11, -12
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33. Woodward FCU Evolution

• 8969199-X >
897799-X
SB A73-0271
• 893561-X and 897770-X > 897800-X
SB A73-0262
• 897780-X and 897375-X > 897801-X
SB A73-0254
The end controls will have incorporated, Fail Low OSG, Non Rotating
Bypass Valve, Vespel Spine and P3 piston. Some of the predecessor
FCU’s have some of these mods in them.
The AG world has alternate method of AD compliance,
( Inspections )
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