Removal of the HPT/LPT ACC Air Valve [IAE]

TASK 75-24-51-000-010-B
Removal of the HPT/LPT ACC Air Valve

WARNING: BE CAREFUL WHEN YOU DO WORK ON THE ENGINE PARTS AFTER THE ENGINE SHUTDOWN. USE APPLICABLE THERMAL GLOVES. THE ENGINE PARTS CAN STAY HOT FOR ONE HOUR AFTER SHUTDOWN AND CAN BURN YOU.

1. Reason for the Job
This task gives the procedure for the removal of the HPT/LPT ACC air valve.
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment

REFERENCE	QTY	DESIGNATION
No specific	AR	ACCESS PLATFORM 2M (6 FT) - ADJUSTABLE
No specific	AR	COVER - PROTECTION
No specific	AR	WARNING NOTICE(S)
IAE1J13504	1	PULLER REMOVAL

B. 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

C. Referenced Information

REFERENCE	DESIGNATION
TASK 71-13-00-010-010-A	Opening 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 78-32-00-010-010-A	Opening of the Thrust Reverser Halves
Active Clearance Control Valve
Active Clearance Control Valve
Active Clearance Control Valve

3. Job Set-up
Subtask 75-24-51-941-052-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 75-24-51-010-057-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) - ADJUSTABLE in position.

Subtask 75-24-51-040-053-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 75-24-51-010-052-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.

4. Procedure
Subtask 75-24-51-020-072-A ** ON A/C NOT FOR ALL

A. Remove the HPT/LPT ACC Air Valve:
(1) Remove the actuator rod assembly from the HPT/LPT ACC air valve.

Active Clearance Control Valve ** ON A/C NOT FOR ALL

(a) Remove and discard the pin (33).
(b) Remove the nut (34) and the bolt (16).
(c) Release the actuator rod assembly (14) from the HPT/LPT ACC air valve (5).
(d) Use the IAE1J13504 PULLER REMOVAL, to remove the bushes (35) and (17) from the actuator rod assembly (14).
(2) Release the stator rod assembly and the rod of the HPT/LPT air valve from the ACC valve rod bracket.

Active Clearance Control Valve ** ON A/C NOT FOR ALL

(a) Remove and discard the pin (32).
(b) Remove the nut (31) and the bolt (18).
(c) Release the stator rod assembly (15) from the HPT/LPT ACC air valve (15).
(d) Use the IAE1J13504 PULLER REMOVAL, to remove the bushes (30) and (19).
(3) Remove the ACC HPT valve bracket from the flange FM.

Active Clearance Control Valve ** ON A/C NOT FOR ALL

(a) Remove the two nuts (9) and the two bolts (12) from the ACC HPT valve bracket (60) on the flange FM.
(b) Remove the ACC HPT valve bracket (60) from the flange FM.
(4) Remove the LPT valve rear flange of the HPT/LPT ACC air valve from the ACC valve bracket assembly on flange FM.

Active Clearance Control Valve ** ON A/C NOT FOR ALL

(a) Remove the two nuts (4) and the two bolts (10) from the ACC valve bracket assembly (1) on flange FM.
(b) Remove the LPT valve rear flange of the HPT/LPT ACC air valve (5) from the ACC valve bracket assembly (1).
(5) Remove the ACC HPT valve bracket from the flange FM.

Active Clearance Control Valve ** ON A/C NOT FOR ALL

(a) Remove the two nuts (2) and the two bolts (11) from the ACC HPT valve bracket (52) on flange FM.
(b) Remove the ACC HPT valve bracket (42) from the flange FM.
(6) Remove the HPT/LPT ACC air valve (5) and related parts from the engine.

Active Clearance Control Valve ** ON A/C NOT FOR ALL

Subtask 75-24-51-620-051-A ** ON A/C NOT FOR ALL

B. Install COVER - PROTECTION to all exposed openings.

Subtask 75-24-51-020-073-A ** ON A/C NOT FOR ALL

C. Remove the HPT/LPT ACC Air Valve:
(1) Remove the heat shield assembly from the HPT/LPT ACC air valve.

Active Clearance Control Valve ** ON A/C NOT FOR ALL

(a) Remove the two nuts (29), the two bolts (22) and the clamps (20) and (21).
(b) Remove the four nuts (27) and the four bolts (26).
(c) Remove the heat shield assembly (28).
(2) Remove the ACC front duct from the HPT/LPT ACC air valve.

Active Clearance Control Valve ** ON A/C NOT FOR ALL

(a) Remove the twelve nuts (25) and the twelve bolts (23).
(b) Remove the ACC front duct (24).
(3) Remove the ACC rear duct assembly from the HPT/LPT ACC air valve.

Active Clearance Control Valve ** ON A/C NOT FOR ALL

(a) Remove the four nuts (6) and the four bolts (7).
(b) Remove the ACC rear duct assembly (8).
(4) Remove the ACC housing and related parts from the HPT/LPT air valve.

Active Clearance Control Valve ** ON A/C NOT FOR ALL

(a) Remove the five bolts (3).
(b) Remove the ACC housing and related parts.
(5) Disassemble the ACC housing and related parts.

Active Clearance Control Valve ** ON A/C NOT FOR ALL

(a) Remove and discard the pin (57).
(b) Remove the nut (58) and the bolt (62).
(c) Remove the ACC HPT valve bracket (60) from the ACC HPT valve link (56).
(d) Remove the bushes (59) and (61) from the ACC HPT valve bracket (60).
(e) Remove and discard the pin (49).
(f) Remove the nut (50) and the bolt (55).
(g) Remove the ACC HPT valve bracket (52) from the ACC HPT valve link (53).
(h) Remove the bushes (51) and (54) from the ACC HPT bracket (52).
(i) Remove and discard the pin (46).
(j) Remove the nut (47) and the bolt (65).
(k) Remove the ACC HPT valve link (56) from the ACC housing (40).
(l) Remove and discard the pin (43).
(m) Remove the nut (44) and the bolt (63).
(n) Remove the ACC HPT link (53) from the ACC housing (40).
(o) Remove the bushes (45), (48), (64) and (66) from the ACC housing (40).
(p) Remove the four bolts (38) from the ACC housing (40).
(q) Remove the joint heat shield (39), the ACC seal retainer (42) and the ACC seal (41) from the ACC housing (40).

[Rev.10 from 2021] 2026.04.01 03:11:33 UTC