Leakage Rates at Drains Mast [IAE]

TASK 71-70-00-600-010-A
Leakage Rates at Drains Mast

1. Reason for the Job
This task supplies the data to do a check of the leakage rates at the drains mast.
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment

REFERENCE	QTY	DESIGNATION
No specific	AR	CONTAINER 5 L (1.32 USGAL)

B. Referenced Information

REFERENCE	DESIGNATION
TASK 29-00-00-790-001-A	Check of the External Leaks of the Hydraulic Components
TASK 71-00-00-700-013-A	Procedure to Dry Out the High Pressure Turbine (HPT) after Oil Contamination
TASK 71-00-00-710-018-A	Discontinued Start, Restart and Shutdown Procedures
TASK 71-00-00-710-043-A	Normal Engine Automatic-Start Procedure
TASK 71-00-00-710-047-A	Normal Engine Manual-Start Procedure
TASK 71-00-00-860-012-A	Engine Safety Precautions
TASK 72-50-00-200-010-A	Inspection of the Turbine Exhaust Case

3. Job Set-up
Subtask 71-70-00-869-050-A ** ON A/C NOT FOR ALL

A. Make sure that the engine safety precautions have been applied (Ref. AMM TASK 71-00-00-860-012).

Subtask 71-70-00-941-051-A ** ON A/C NOT FOR ALL

B. Put the CONTAINER 5 L (1.32 USGAL) below the drains mast.

4. Procedure
Subtask 71-70-00-790-050-A ** ON A/C NOT FOR ALL

A. Start the engine (Ref. AMM TASK 71-00-00-710-043) or (Ref. AMM TASK 71-00-00-710-047) and set the engine power to idle.

Subtask 71-70-00-790-051-A ** ON A/C NOT FOR ALL

B. Check for leaks at the drains mast

CAUTION: IF DURING A COLD WEATHER START THE GROUND CREW REPORTS A FUEL LEAK FROM THE FUEL PUMP DRAIN MAST, RUN THE ENGINE AT IDLE FOR FIVE MINUTES. IF THE LEAK STOPS DURING THE FIVE MINUTES, THE AIRCRAFT CAN BE DISPATCHED WITHOUT MAINTENANCE ACTION.

CAUTION: IF THE LEAK IS STILL PRESENT AFTER FIVE MINUTES, MAKE SURE THAT THE LEAKAGE RATE IS WITHIN THE LIMITS STATED IN TABLE 1.

CAUTION: IF THE LEAKAGE RATE IS MORE THAN THE LIMITS STATED IN TABLE 1, THE AIRCRAFT CAN CONTINUE TO FLY FOR A MAXIMUM OF 25 HOURS OR 10 FLIGHTS, WHATEVER OCCURS FIRST, PROVIDED THAT THE LEAKAGE RATE IS NOT MORE THAN THE LIMITS STATED IN TABLE 2.

(1) Compare the quantity got to the limits shown in the tables which follow:

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! UNIT ! LIMIT ! DRAIN !

! --------------------------------

! ! cc/hr !drops/min! MAST PORTS!

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!FUEL UNITS ! ! ! !

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! Fuel Pumps - Fuel only ! 30 ! 10 ! F.P !

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! Fuel Pumps - Fuel and Oil Mixture ! 10 ! 3 ! F.P !

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! Fuel Pumps - Oil only ! 10 ! 3 ! F.P !

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! Booster Stage Bleed Valve Actuator - Master! 10 ! 3 ! CORE !

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! Booster Stage Bleed Valve Actuator - Slave ! 10 ! 3 ! CORE !

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! Fuel Diverter Unit ! 0 ! 0 ! F.D !

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! Fuel Metering Unit ! 0 ! 0 ! F.M.U !

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! Air Cooled Oil Cooler ! 0 ! 0 ! A.C.O.C!

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! Active Clearance Control ! 10 ! 3 ! CORE !

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! Variable Stator Vane Actuator ! 10 ! 3 ! CORE !

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!OIL UNITS ! ! ! !

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! Air Starter ! 10 ! 3 ! S !

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! Integrated Drive Generator ! 10 ! 3 ! I.D.G !

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!HYDRAULIC UNIT ! ! ! !

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! Hydraulic Pump - Hydraulic Fluid/Gearbox ! 10 ! 3 ! HYD !

! Oil Mixture ! ! ! !

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! Hydraulic Pump - Gearbox Oil only ! 10 ! 3 ! HYD !

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Table 1

NOTE: The drops/minute rates are calculated from the formula that follows:

20 x cc/hr

----------------------- = Drops/Minute

NOTE: For Hydraulic Fluid Leakage only refer to (Ref. AMM TASK 29-00-00-790-001).

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!UNIT ! LIMIT ! DRAIN !

! -------------------------------

! !cc/hr !drops/min! MAST PORTS!

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!FUEL UNITS ! ! ! !

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! Fuel Pumps - Fuel only ! 120 ! 40 ! F.P !

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! Fuel Pumps - Fuel and Oil Mixture ! 10 ! 3 ! F.P !

-------------------------------------------------------------------------------

! Fuel Pumps - Oil only ! 10 ! 3 ! F.P !

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! Booster Stage Bleed Valve Actuator - Master ! 120 ! 40 ! CORE !

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! Booster Stage Bleed Valve Actuator - Slave ! 120 ! 40 ! CORE !

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! Fuel Diverter Unit ! 120 ! 40 ! F.D !

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! Fuel Metering Unit ! 120 ! 40 ! F.M.U !

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! Air Cooled Oil Cooler ! 120 ! 40 ! A.C.O.C !

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! Active Clearance Control ! 120 ! 40 ! CORE !

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! Variable Stator Vane Actuator ! 120 ! 40 ! CORE !

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!OIL UNITS ! ! ! !

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! Air Starter ! 10 ! 3 ! S !

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! Integrated Drive Generator ! 10 ! 3 ! I.D.G !

-------------------------------------------------------------------------------

!HYDRAULIC UNIT ! ! ! !

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! Hydraulic Pump - Hydraulic Fluid only ! 10 ! 3 ! HYD !

-------------------------------------------------------------------------------

! Hydraulic Pump - Hydraulic Fluid/Gearbox ! 10 ! 3 ! HYD !

! Oil Mixture ! ! ! !

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! Hydraulic Pump - Gearbox Oil only ! 10 ! 3 ! HYD !

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Table 2

5. Close-up
Subtask 71-70-00-869-051-A ** ON A/C NOT FOR ALL

A. Stop the engine (Ref. AMM TASK 71-00-00-710-018).

Subtask 71-70-00-942-050-A ** ON A/C NOT FOR ALL

B. Remove the container and discard all drained fuel or oil.

Subtask 71-70-00-710-050-A ** ON A/C NOT FOR ALL

C. Do an inspection of the turbine exhaust case for oil.
(1) Visually inspect the turbine exhaust case for oil that came out of the No.4 bearing weep tube port (Ref. AMM TASK 72-50-00-200-010).
(2) If there is oil, do the procedure to dry out the high pressure turbine after oil contamination (Ref. AMM TASK 71-00-00-700-013).

[Rev.10 from 2021] 2026.04.01 02:30:55 UTC