Removal of the Pack-Inlet Pressure Sensor

TASK 21-51-13-000-001-A
Removal of the Pack-Inlet Pressure Sensor

FIN: 23HB1 ** ON A/C NOT FOR ALL
FIN: 24HB1 ** 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	SAFETY CLIP - CIRCUIT BREAKER

B. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
FOR [23HB1] (SENSOR-PRESS INLET,PACK 1)
191KB
FOR [24HB1] (SENSOR-PRESS INLET,PACK 2)
192KB

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-Inlet Pressure Sensor

3. Job Set-up
Subtask 21-51-13-861-050-A ** ON A/C NOT FOR ALL

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

Subtask 21-51-13-865-050-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: 23HB1 (SENSORPRESS INLET,PACK 1)
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: 24HB1 (SENSORPRESS INLET,PACK 2)
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 21-51-13-010-050-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 [23HB1] (SENSOR-PRESS INLET,PACK 1)
191KB
(b) FOR [24HB1] (SENSOR-PRESS INLET,PACK 2)
192KB

4. Procedure
Subtask 21-51-13-020-050-A ** ON A/C NOT FOR ALL

A. Removal of the Pressure Sensor
(1) Remove the screws (6), the washers (5) and the clamp (4).
(2) Discard the washers (5).
(3) Loosen and partially remove the screws (1).
(4) Push the screws (1) to disconnect the sensor (8) from the sensor mount (11).
(5) Remove the screws (1) and the washers (2).

NOTE: Make sure that the inserts (3) stay in the sensor mount (11).

(6) Disconnect the electrical connector (7) and remove the sensor (8).
(7) Remove and discard the O-ring (10).

[Rev.10 from 2021] 2026.04.05 10:34:31 UTC