Check Zone 2 Ventilation Intake Holes (in Thrust Reverser C-Ducts) and Exit for Blockage [IAE]

TASK 75-21-00-200-011-A
Check Zone 2 Ventilation Intake Holes (in Thrust Reverser C-Ducts) and Exit for Blockage

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

FIN: 1000EM1 ** ON A/C NOT FOR ALL
FIN: 1000EM2 ** ON A/C NOT FOR ALL

1. Reason for the Job
Refer to the MPD TASK: 752100-I2
CHECK ZONE 2 VENTILATION INTAKE HOLES (IN THRUST REVERSER C-DUCTS) AND EXIT FOR BLOCKAGE
This task gives the procedure for a general check of the core compartment cooling zone without component removal.
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment

REFERENCE	QTY	DESIGNATION
No specific	AR	ACCESS PLATFORM 2M (6 FT)
No specific	AR	WARNING NOTICE(S)

B. Consumable Materials

REFERENCE	DESIGNATION
(Material No.V01-002)	cleaning fluid
(Material No.14SBA1)	Textile-Lint free Cotton -

C. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
FOR [1000EM1] (ENGINE-1)
437AL, 438AR, 451AL, 452AR
FOR [1000EM2] (ENGINE-2)
447AL, 448AR, 461AL, 462AR

D. Referenced Information

REFERENCE	DESIGNATION
TASK 71-13-00-010-010-A	Opening of the Fan Cowls 437AL(447AL),438AR(448AR)
TASK 71-13-00-410-010-A	Closing of the Fan Cowls 437AL(447AL),438AR(448AR)
TASK 78-30-00-040-012-A	Deactivation of the Thrust Reverser Hydraulic Control Unit (HCU) for Ground Maintenance
TASK 78-30-00-440-012-A	Re-activation of the Thrust Reverser Hydraulic Control Unit (HCU) after Ground Maintenance
TASK 78-32-00-010-010-A	Opening of the Thrust Reverser Halves
TASK 78-32-00-410-010-A	Closing of the Thrust Reverser Halves
Nacelle Compartment and Accessory Cooling System
Thrust Recovery Nozzle

3. Job Set-up
Subtask 75-21-00-941-051-A ** ON A/C NOT FOR ALL

A. Safety Precautions
(1) On the center pedestal, on the ENG panel 115VU:
(a) Put a WARNING NOTICE(S) to tell persons not to start the engine.
(2) Make sure that the engine 1(2) shutdown occurred not less than 5 minutes before you do this procedure.
(3) On the overhead maintenance panel 50VU:
(a) Make sure that the ON legend of the ENG/FADEC GND PWR/1(2) pushbutton switch is off.
(b) Put a WARNING NOTICE(S) to tell persons not to energize the FADEC 1(2).

Subtask 75-21-00-010-051-A ** ON A/C NOT FOR ALL

B. Get Access
(1) Open the fan cowls (Ref. AMM TASK 71-13-00-010-010):
(a) FOR [1000EM1] (ENGINE-1)
437AL 438AR.
(b) FOR [1000EM2] (ENGINE-2)
447AL 448AR.
(2) Put the ACCESS PLATFORM 2M (6 FT) in position.

Subtask 75-21-00-040-050-A ** ON A/C NOT FOR ALL

C. Deactivate the Thrust Reverser.

WARNING: MAKE SURE THAT THE THRUST REVERSER HYDRAULIC CONTROL UNIT (HCU) IS DEACTIVATED BEFORE YOU DO WORK ON OR AROUND THE THRUST REVERSER. IF THE HCU IS NOT DEACTIVATED, THERE IS A RISK OF UNWANTED THRUST REVERSER OPERATION WHICH CAN CAUSE INJURY TO PERSONS AND/OR DAMAGE TO EQUIPMENT.

(1) Deactivate the thrust reverser hydraulic control unit (HCU) (Ref. AMM TASK 78-30-00-040-012).

Subtask 75-21-00-010-052-A ** ON A/C NOT FOR ALL

D. Open the thrust reverser halves (Ref. AMM TASK 78-32-00-010-010):
(1) FOR [1000EM1] (ENGINE-1)
451AL 452AR.
(2) FOR [1000EM2] (ENGINE-2)
461AL 462AR.

Subtask 75-21-00-110-051-A ** ON A/C NOT FOR ALL

E. Clean the Core Compartment.
(1) Clean the core compartment and the parts that follow with a Textile-Lint free Cotton - (Material No.14SBA1) made moist with cleaning fluid (Material No.V01-002) .
(a) ACC Actuator ventilation hole
(b) Stage 10 to HPT Air Control Valve ventilation hole
(c) High Pressure Bleed Valve ventilation hole
(d) Bleed Pressure Regulator Valve ventilation holes
(e) Forward engine mount ventilation holes
(f) Electrical connector 4007VC-A ventilation hole
(g) ACC Duct De-tuning holes
(h) Lower bifurcation aft latches ventilation holes
(i) LPC Bleed Master Actuator ventilation hole
(j) LPC Bleed Slave Actuator ventilation hole
(2) Clean the thrust recovery nozzle or core compartment vent with a Textile-Lint free Cotton - (Material No.14SBA1) made moist with cleaning fluid (Material No.V01-002) .

4. Procedure
Subtask 75-21-00-210-051-A ** ON A/C NOT FOR ALL

A. Examine the core compartment ventilation holes for blockage or other obvious damage
(1) Examine the ACC Actuator ventilation hole (1).
(2) Examine the Stage 10 to HPT Air Control Valve ventilation hole (2).
(3) Examine the High Pressure Bleed Valve ventilation hole (3).
(4) Examine the Bleed Pressure Regulator Valve ventilation holes (4) and (5).

NOTE: Ventilation hole (5) only applies to V2500-A5 engines post SB 78-0087.

(5) Examine the forward engine mount ventilation holes (6) and (7).
(6) Examine the electrical connector 4007VC-A ventilation hole (8).
(7) Examine the ACC Duct De-tuning holes (9).

NOTE: This applies to all V2500-A5 engines and V2500-A1 engines post SB 78-0058.

(8) Examine the lower bifurcation aft latches ventilation holes (10) if present.
(9) Examine the LPC Bleed Master Actuator ventilation hole (11).

NOTE: This applies to V2500-A5 engines post SB 78-0087.

(10) Examine the LPC Bleed Slave Actuator ventilation hole (12).

NOTE: This applies to V2500-A5 engines post SB 78-0127.

Subtask 75-21-00-210-053-A ** ON A/C NOT FOR ALL

B. Examine the Thrust Recovery Nozzle for Blockage or other Obvious Damage

Thrust Recovery Nozzle ** ON A/C NOT FOR ALL

NOTE: This may not be present on some V2500-A1 engines. If not present then check the core compartment vent.

5. Close-up
Subtask 75-21-00-410-051-A ** ON A/C NOT FOR ALL

A. Close Access
(1) Make sure that the work area is clean and clear of tools and other items.
(2) Close the thrust reverser halves (Ref. AMM TASK 78-32-00-410-010):
(a) FOR [1000EM1] (ENGINE-1)
451AL 452AR.
(b) FOR [1000EM2] (ENGINE-2)
461AL 462AR.

Subtask 75-21-00-440-050-A ** ON A/C NOT FOR ALL

B. Activate the thrust reverser HCU (Ref. AMM TASK 78-30-00-440-012).

Subtask 75-21-00-410-052-A ** ON A/C NOT FOR ALL

C. Close Access
(1) Close the fan cowls (Ref. AMM TASK 71-13-00-410-010):
(a) FOR [1000EM1] (ENGINE-1)
437AL 438AR.
(b) FOR [1000EM2] (ENGINE-2)
447AL 448AR.
(2) Remove the access platform(s).
(3) Remove the WARNING NOTICE(S).

[Rev.10 from 2021] 2026.04.01 03:11:04 UTC