Test No. 2 - Engine Motor Leak Test (Dry Method) [PW11]

TASK 71-00-00-720-809-A
Test No. 2 - Engine Motor Leak Test (Dry Method)

WARNING: BE CAREFUL WHEN YOU DO WORK ON THE ENGINE AFTER SHUTDOWN. THE ENGINE CAN STAY HOT FOR A LONG TIME. IF YOU DO NOT OBEY THIS INSTRUCTION, INJURY CAN OCCUR.

WARNING: BE CAREFUL WHEN YOU USE CONSUMABLE MATERIALS. OBEY THE MATERIAL MANUFACTURER'S INSTRUCTIONS AND YOUR LOCAL REGULATIONS.

CAUTION: MAKE SURE THE FAN COWLS ARE SECURELY HELD OPEN DURING MONITORING. MAKE SURE HOLD OPEN RODS ARE SERVICEABLE.

1. Reason for the Job
Use this procedure to check the fuel system (except the fuel manifolds and nozzles) and the oil system for leaks. The engine is operated by the starter only for this test.
The dry-motor leak test uses the engine starter only to operate the engine for a short time to check for leaks in the fuel or oil system. The ignition system is OFF for this test. The fuel goes to the fuel pump (for pump lubrication) but not to the engine fuel manifolds and nozzles. The actuators fuel lines cannot be examined by this method. This procedure is recommended for most motor leak checks unless the wet-motor check is specified.
2. Job Set-up Information
A. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENG 1)
437AL, 438AR, 451AL, 452AR
FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENG 2)
447AL, 448AR, 461AL, 462AR

B. Referenced Information

REFERENCE	DESIGNATION
TASK 71-00-00-860-817-A	Motor the Engine (Dry Method)
TASK 71-13-00-010-802-A	Opening of the Fan Cowl Doors
TASK 71-13-00-410-802-A	Closing of the Fan Cowl Doors
TASK 78-30-00-040-805-A	Deactivation of the Thrust Reverser System for Ground Maintenance
TASK 78-30-00-440-805-A	Reactivation of the Thrust Reverser System after Ground Maintenance
TASK 78-36-00-010-802-A	Opening of the Thrust Reverser Cowl-Doors
TASK 78-36-00-410-802-A	Closing of the Thrust Reverser Cowl-Doors

3. Job Set-up
Subtask 71-00-00-941-127-A ** ON A/C NOT FOR ALL

A. Safety Precautions
(1) Prepare the engine motor dry method (Ref. AMM TASK 71-00-00-860-817).

Subtask 71-00-00-010-217-A ** ON A/C NOT FOR ALL

B. Get Access
(1) Open the fan cowl doors (Ref. AMM TASK 71-13-00-010-802):
(a) FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENG 1)
437AL 438AR
(b) FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENG 2)
447AL 448AR

Subtask 71-00-00-040-117-A ** ON A/C NOT FOR ALL

C. Deactivation of the Thrust Reverser for Maintenance

WARNING: YOU MUST DEACTIVATE THE THRUST REVERSER BEFORE YOU DO WORK ON OR AROUND IT. IF YOU DO NOT, THE THRUST REVERSER CAN OPERATE ACCIDENTALLY AND CAUSE AN INJURY AND/OR DAMAGE.

(1) Do the deactivation of the thrust reverser system for maintenance (Ref. AMM TASK 78-30-00-040-805).

Subtask 71-00-00-010-218-A ** ON A/C NOT FOR ALL

D. Get Access
(1) Open the thrust reverser cowl-doors (Ref. AMM TASK 78-36-00-010-802):
(a) FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENG 1)
451AL 452AR
(b) FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENG 2)
461AL 462AR

4. Procedure

CAUTION: WIPE CLEAN ALL PARTS AND TOOLS AS NECESSARY TO REMOVE UNWANTED DEBRIS AND PREVENT DAMAGE TO THE ENGINE.

Subtask 71-00-00-720-079-A ** ON A/C NOT FOR ALL

A. Engine Motor Leak Test (Dry Method)
(1) Do the engine motor dry method (Ref. AMM TASK 71-00-00-860-817).
(2) Do the engine leak check as follows:
(a) While the engine is motored, do a visual check for leaks at the fuel and oil system tubes and joints.

NOTE: Although this procedure can be used to find a leak at the external fuel or oil system tubes and components, you cannot find leaks at the fuel distribution valve, fuel nozzles and fuel manifolds with this procedure.

5. Close-up
Subtask 71-00-00-860-193-A ** ON A/C NOT FOR ALL

A. Put the aircraft back to its initial configuration.
(1) Return the engine to its initial configuration as per the engine motor dry method (Ref. AMM TASK 71-00-00-860-817).
(2) Close the thrust reverser cowl-doors (Ref. AMM TASK 78-36-00-410-802):
(a) FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENG 1)
451AL, 452AR
(b) FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENG 2)
461AL, 462AR.
(3) Do the reactivation of the thrust reverser system after maintenance (Ref. AMM TASK 78-30-00-440-805).
(4) Close the fan cowl doors (Ref. AMM TASK 71-13-00-410-802):
(a) FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENG 1)
437AL, 438AR
(b) FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENG 2)
447AL, 448AR.

[Rev.10 from 2021] 2026.04.01 04:32:25 UTC