Inspection of the Crossbleed Valve

TASK 36-12-52-200-803-A
Inspection of the Crossbleed Valve

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

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

REFERENCE	QTY	DESIGNATION
No specific	1	ACCESS PLATFORM 3M (10 FT)- ADJUSTABLE
No specific	AR	SAFETY CLIP - CIRCUIT BREAKER
No specific	AR	WARNING NOTICE(S)

B. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
192FB

C. Referenced Information

REFERENCE	DESIGNATION
Crossbleed Valve

3. Job Set-up
Subtask 36-12-52-865-060-A

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

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C ALL
49VU	AIR BLEED/X FEED/VALVE/BAT	2HV	D13
49VU	AIR BLEED/ENG 2/MONG	3HA2	D12
49VU	AIR BLEED/ENG 1/CTL	2HA1	D11
122VU	AIR BLEED/ENG 1/MONG	3HA1	Z23
122VU	AIR BLEED/ENG 2/CTL	2HA2	Z22
122VU	AIR BLEED/X FEED VALVE/NORM	1HV	Z20

Subtask 36-12-52-860-056-A

B. Aircraft Maintenance Configuration
(1) Put the WARNING NOTICE(S) in position:

In the cockpit, on engine control panel 115VU to tell persons not to start the engine(s)
In the cockpit, on AIR COND overhead panel 30VU to tell persons not to push the APU BLEED pushbutton switch
On the HP ground connector to tell persons not to pressurize the pneumatic system.

(2) Put the ACCESS PLATFORM 3M (10 FT)- ADJUSTABLE in position below access panel 192FB.

Subtask 36-12-52-010-054-A

C. Get Access
(1) Remove access panel 192FB.

4. Procedure
Subtask 36-12-52-220-052-A

A. Inspection of the Crossbleed Valve
(1) Do a visual inspection of the crossbleed valve for dents, scores and corrosion.
(2) Make sure that the electrical connector is correctly connected to the crossbleed valve.
(3) Make sure that the clamps are correctly installed.
(4) Move the manual override lever and position indicator three times to the fully open and fully closed positions.

NOTE: Do this workstep only on crossbleed valves that have a manual override lever installed.

(a) Make sure that the butterfly plate moves freely.
(b) Listen for the click while the butterfly plate closes.

5. Close-up
Subtask 36-12-52-410-054-A

A. Close Access
(1) Make sure that the work area is clean and clear of tools and other items.
(2) Install access panel 192FB.

Subtask 36-12-52-942-058-A

B. Put the aircraft back to its initial configuration.
(1) Remove the access platform(s).
(2) Remove the WARNING NOTICE(S).

Subtask 36-12-52-865-061-A

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

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C ALL
49VU	AIR BLEED/X FEED/VALVE/BAT	2HV	D13
49VU	AIR BLEED/ENG 2/MONG	3HA2	D12
49VU	AIR BLEED/ENG 1/CTL	2HA1	D11
122VU	AIR BLEED/ENG 1/MONG	3HA1	Z23
122VU	AIR BLEED/ENG 2/CTL	2HA2	Z22
122VU	AIR BLEED/X FEED VALVE/NORM	1HV	Z20

[Rev.10 from 2021] 2026.04.01 01:15:48 UTC