Delta P Sense Lines Torque Check and Inspection

TASK 21-51-00-200-001-A
Delta P Sense Lines Torque Check and Inspection

FIN: 10HB ** ON A/C NOT FOR ALL
FIN: 11HB ** ON A/C NOT FOR ALL
FIN: 8HB ** ON A/C NOT FOR ALL
FIN: 9HB ** ON A/C NOT FOR ALL

1. Reason for the Job
Referenced from TSM
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment

REFERENCE	QTY	DESIGNATION
No specific	AR	SAFETY CLIP - CIRCUIT BREAKER
No specific	Torque wrench: range to between 1.05 and 0.95 m.daN (92.92 and 84.07 lbf.in )

B. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
FOR [10HB] (P1 FLOW SENSOR)
191KB
FOR [11HB] (P1 FLOW CTL VALVE)
191BB, 191KB
FOR [8HB] (P2 FLOW CTL VALVE)
192KB
FOR [9HB] (P2 FLOW SENSOR)
191BB, 192KB

C. Referenced Information

REFERENCE	DESIGNATION
TASK 12-33-21-618-001-A-01	Pre-conditioning through the HP Ground Connection
TASK 12-33-21-618-001-A-02	Pre-conditioning with the APU
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 24-41-00-862-002-A	De-energize the Aircraft Electrical Circuits Supplied from the External Power
TASK 24-41-00-862-002-A-01	De-energize the Aircraft Electrical Circuits Supplied from the APU
TASK 24-41-00-862-002-A-02	De-energize the Aircraft Electrical Circuits Supplied from the Engine 1(2)
TASK 53-35-13-000-002-A	Removal of the Quick-Release Access Panels from the Belly Fairing Structure
TASK 53-35-13-400-002-A	Installation of the Quick-Release Access Panels on the Belly Fairing Structure
Sense Lines - Component location

3. Job Set-up
Subtask 21-51-00-861-055-A ** ON A/C NOT FOR ALL

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

Subtask 21-51-00-865-057-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: 11HB (P1 FLOW CTL VALVE) FOR FIN: 10HB (P1 FLOW SENSOR)
122VU	AIR COND/PACK TEMP/CTL SYS1/1/115VAC	1HH	X22
122VU	AIR COND/PACK TEMP CTL SYS2/1/115VAC	2HH	Y18
FOR FIN: 9HB (P2 FLOW SENSOR) FOR FIN: 8HB (P2 FLOW CTL VALVE)
122VU	AIR COND/PACK TEMP/CTL SYS1/2/115VAC	21HH	W22
122VU	AIR COND/PACK TEMP CTL SYS2/2/115VAC	22HH	Y20

Subtask 21-51-00-941-053-A ** ON A/C NOT FOR ALL

C. Safety Precautions
(1) On the panel 30VU:
(a) Make sure that:

the APU BLEED pushbutton switch is in the off position (the ON legend is off) and,
the ENG 1 BLEED and the ENG 2 BLEED pushbutton switches are in the off position (the OFF legends are on).

(b) Put a warning notice in position to tell persons not to operate these pushbutton switches.
(2) On the HP ground connector put a warning notice in position to tell persons not to supply the ground air.

Subtask 21-51-00-010-053-A ** ON A/C NOT FOR ALL

D. Get Access
(1) Remove the access panels (Ref. AMM TASK 53-35-13-000-002):
(a) FOR [10HB] (P1 FLOW SENSOR)
and
(b) FOR [11HB] (P1 FLOW CTL VALVE)
191KB and 191BB.
(c) FOR [8HB] (P2 FLOW CTL VALVE)
and
(d) FOR [9HB] (P2 FLOW SENSOR)
192KB 191BB.

4. Procedure
Subtask 21-51-00-210-050-A ** ON A/C NOT FOR ALL

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.

WARNING: DO NOT TOUCH THE COMPONENT UNTIL IT IS SUFFICIENTLY COOL TO PREVENT BURNS.

A. Sense Line Torque Check and Inspection

Sense Lines - Component location ** ON A/C NOT FOR ALL

(1) TORQUE
(a) Do a check of the torque value of the sense line connections (2).
The value must be to between 1.05 and 0.95 m.daN (92.92 and 84.07 lbf.in )

.
(2) Inspection
(a) Disconnect the quick release connector (4).
(b) Make sure that the quick release connector (4) and the union (5) are clean and in the correct condition.
(c) Connect the quick release connector (4).
(d) Do a visual inspection of the sense lines (1) and (3) for damage, cracks and fraying of the material.

NOTE: You must replace all damaged, cracked or frayed sense lines.

Subtask 21-51-00-865-058-A ** ON A/C NOT FOR ALL

B. Remove the safety clip(s) and the tag(s) and close this(these) circuit breaker(s):

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C NOT FOR ALL
FOR FIN: 11HB (P1 FLOW CTL VALVE) FOR FIN: 10HB (P1 FLOW SENSOR)
122VU	AIR COND/PACK TEMP/CTL SYS1/1/115VAC	1HH	X22
122VU	AIR COND/PACK TEMP CTL SYS2/1/115VAC	2HH	Y18
FOR FIN: 9HB (P2 FLOW SENSOR) FOR FIN: 8HB (P2 FLOW CTL VALVE)
122VU	AIR COND/PACK TEMP/CTL SYS1/2/115VAC	21HH	W22
122VU	AIR COND/PACK TEMP CTL SYS2/2/115VAC	22HH	Y20

Subtask 21-51-00-941-054-A ** ON A/C NOT FOR ALL

C. Remove the WARNING NOTICE(S).

Subtask 21-51-00-710-053-A ** ON A/C NOT FOR ALL

D. Test
(1) Do the pre-conditioning through the HP ground connector (Ref. AMM TASK 12-33-21-618-001) or with the APU (Ref. AMM TASK 12-33-21-618-001).
(2) Sense Line Leak Test

WARNING: PUT ON PROTECTIVE GOGGLES AND THERMAL GLOVES WHEN YOU GO NEAR AN AIR-CONDITIONING PACK WHEN IT OPERATES. THERE CAN BE LEAKAGE OF HOT AIR, WHICH CAN CAUSE INJURIES.

(a) With a soapy water solution, do a leak check of the sense lines (1) and (3) and the sense line connections (2), (4) and (6).

NOTE: Leaks are not permitted.

(3) After approx. 15 minutes, stop the pre-conditioning (Ref. AMM TASK 12-33-21-618-001) or (Ref. AMM TASK 12-33-21-618-001).

5. Close-up
Subtask 21-51-00-410-055-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) Install the access panels (Ref. AMM TASK 53-35-13-400-002):
(a) FOR [10HB] (P1 FLOW SENSOR)
191KB
(b) FOR [11HB] (P1 FLOW CTL VALVE)
191KB
(c) FOR [8HB] (P2 FLOW CTL VALVE)
192KB
(d) FOR [9HB] (P2 FLOW SENSOR)
191BB

Subtask 21-51-00-862-054-A ** ON A/C NOT FOR ALL

B. De-energize the aircraft electrical circuits (Ref. AMM TASK 24-41-00-862-002).

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