Removal of the Pack Discharge Pressure Sensor

TASK 21-61-14-000-001-A
Removal of the Pack Discharge Pressure Sensor

WARNING: MAKE SURE THAT AIR IS NOT SUPPLIED TO THE AIR CONDITIONING SYSTEM FROM THE MAIN ENGINE, THE APU OR A GROUND SOURCE. HOT COMPRESSED AIR CAN CAUSE INJURY TO PERSONNEL.

NOTE: The procedure is the same for the pack discharge pressure sensors 14HH and 20HH.

FIN: 14HH ** ON A/C NOT FOR ALL
FIN: 20HH ** ON A/C NOT FOR ALL

1. Reason for the Job
Self explanatory
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment

REFERENCE	QTY	DESIGNATION
No specific	AR	CAP - BLANKING
No specific	AR	PLUG - BLANKING
No specific	AR	SAFETY CLIP - CIRCUIT BREAKER

B. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
FOR [14HH] (P1 PACK DISCH PRESS SENSOR)
191KB
FOR [20HH] (P2 PACK DISCH PRESS SENSOR)
192FB

C. Referenced Information

REFERENCE	DESIGNATION
TASK 24-41-00-861-002-A	Energize the Aircraft Electrical Circuits from the External Power
TASK 24-41-00-861-002-A-01	Energize the Aircraft Electrical Circuits from the APU
TASK 24-41-00-861-002-A-02	Energize the Aircraft Electrical Circuits from Engine 1(2)
TASK 53-35-13-000-002-A	Removal of the Quick-Release Access Panels from the Belly Fairing Structure
Pack Discharge Pressure Sensor

3. Job Set-up
Subtask 21-61-14-861-050-A ** ON A/C NOT FOR ALL

A. Energize the aircraft electrical circuits (Ref. AMM TASK 24-41-00-861-002).

Subtask 21-61-14-865-050-A ** ON A/C NOT FOR ALL

B. Open, safety and tag this(these) circuit breaker(s):

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C NOT FOR ALL
FOR FIN: 14HH (P1 PACK DISCH PRESS SENSOR)
49VU	AIR COND/TEMP CTL/SYS 1 CHAN B/28VDC	52HH	D08
122VU	AIR COND/TEMP CTL SYS 1/CHAN A/115VAC	49HH	X22
122VU	AIR COND/TEMP CTL SYS 1/CHAN A/28VDC	51HH	X21
122VU	AIR COND/TEMP CTL SYS 1/CHAN B/115VAC	50HH	Y18
FOR FIN: 20HH (P2 PACK DISCH PRESS SENSOR)
122VU	AIR COND/TEMP CTL SYS 2/CHAN A/115VAC	53HH	W22
122VU	AIR COND/TEMP CTL SYS 2/CHAN A/28VDC	55HH	W21
122VU	AIR COND/TEMP CTL SYS 2/CHAN B/28VDC	56HH	Y21
122VU	AIR COND/TEMP CTL SYS 2/CHAN B/115VAC	54HH	Y20

Subtask 21-61-14-010-050-A ** ON A/C NOT FOR ALL

C. Get Access
(1) Remove the access panel (Ref. AMM TASK 53-35-13-000-002),
(a) FOR [14HH] (P1 PACK DISCH PRESS SENSOR)
191KB.
(b) FOR [20HH] (P2 PACK DISCH PRESS SENSOR)
192FB.

4. Procedure
Subtask 21-61-14-020-050-A ** ON A/C NOT FOR ALL

A. Removal of the Pack Discharge Pressure Sensor
(1) Disconnect the electrical connector (1).
(2) Put the CAP-BLANKING on each disconnected electrical connector and receptacle.
(3) Disconnect the pressure sense lines (9) and (10).
(4) Put the PLUG-BLANKING in each disconnected line end.
(5) Remove the nut (2), the washer (3), the screw (4) and disconnect the bonding strap (5).
(6) Remove the screws (6) and the washers (7).
(7) Remove the pack discharge pressure sensor (11) and the clamps (8) at the same time.
(8) Remove the clamps (8) from the pack discharge pressure sensor (11).

[Rev.10 from 2021] 2026.04.02 06:11:37 UTC