Discard O-Ring Seals on Hot Air Inlet Ducting, Pack Ducting and Trim Air Ducting

TASK 21-52-00-920-002-A
Discard O-Ring Seals on Hot Air Inlet Ducting, Pack Ducting and Trim Air Ducting

ZONE: 190

1. Reason for the Job
Refer to the MPD TASK: 215200-08
DISCARD O-RING SEALS ON HOT AIR INLET DUCTING, PACK DUCTING AND TRIM AIR DUCTING.
2. Job Set-up Information
A. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
190	BELLY FAIR, AIR CONDITIONING & HYD COMPT

B. Referenced Information

REFERENCE	DESIGNATION
TASK 21-51-51-000-001-A	Removal of the Pack Flow-Control Valve/ Pack Flow-Control Unit
TASK 21-51-51-400-001-A	Installation of the Pack Flow-Control Valve/Pack Flow-Control Unit
TASK 21-63-42-000-001-A	Removal of the Trim-Air Check Valves
TASK 21-63-42-400-001-A	Installation of the Trim-Air Check Valves
TASK 21-63-52-000-001-A	Removal of the Pressure Regulating Valve
TASK 21-63-52-400-001-A	Installation of the Pressure Regulating Valve

3. Job Set-up
Subtask 21-52-00-010-073-A ** ON A/C NOT FOR ALL

A. Not applicable

4. Procedure
Subtask 21-52-00-920-051-A ** ON A/C NOT FOR ALL

A. Replacement of the O-ring Seals
(1) Remove, discard and replace the O-ring seals of:
(a) The flow control valves or the flow control units [8HB] [11HB] [23HB] [24HB]
(Ref. AMM TASK 21-51-51-000-001) and (Ref. AMM TASK 21-51-51-400-001).
(b) The trim-air check valves [18HM] [19HM]
(Ref. AMM TASK 21-63-42-000-001) and (Ref. AMM TASK 21-63-42-400-001).
(c) The trim-air pressure-regulating valve [14HK]
(Ref. AMM TASK 21-63-52-000-001) and (Ref. AMM TASK 21-63-52-400-001).

[Rev.10 from 2021] 2026.04.02 06:11:24 UTC