Inspection of the Crossbleed Valve

TASK 36-12-52-200-001-A
Inspection of the Crossbleed Valve

WARNING: MAKE SURE THAT THE PNEUMATIC SYSTEM IS DEPRESSURIZED BEFORE YOU START WORK. PRESSURIZED AIR CAN CAUSE INJURY TO PERSONNEL.

FIN: 6HV ** 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	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 6HV

3. Job Set-up
Subtask 36-12-52-865-053-A ** ON A/C NOT FOR ALL

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

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C NOT FOR ALL
49VU	AIR BLEED/X FEED/VALVE/BAT	2HV	D13
49VU	AIR BLEED/ENG 1/CTL	3HA1	D12
49VU	AIR BLEED/ENG 1/MONG	2HA1	D11
122VU	AIR BLEED/ENG 2/CTL	3HA2	Z23
122VU	AIR BLEED/ENG 2/MONG	2HA2	Z22
122VU	AIR BLEED/X FEED VALVE/NORM	1HV	Z20

Subtask 36-12-52-860-054-A ** ON A/C NOT FOR ALL

B. Safety Precautions
(1) Put the WARNING NOTICE(S) in position:

in the cockpit on the Engine Control Panel 115VU to tell persons not to start the engine(s),
in the cockpit on the AIR COND Overhead Control Panel 30VU to tell persons not to push in 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 the access panel 192FB.

Subtask 36-12-52-010-051-A ** ON A/C NOT FOR ALL

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

Subtask 36-12-52-020-053-B ** ON A/C NOT FOR ALL

D. Removal of the Muff
(1) Remove the muff of the crossbleed valve.

4. Procedure
Subtask 36-12-52-220-050-A ** ON A/C NOT FOR ALL

A. Inspection of the Crossbleed Valve
(1) Examine 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 closed position.

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

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

5. Close-up
Subtask 36-12-52-420-052-B ** ON A/C NOT FOR ALL

A. Installation of the Muff
(1) Install the muff of the crossbleed valve.

Subtask 36-12-52-410-051-A ** ON A/C NOT FOR ALL

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

Subtask 36-12-52-942-054-A ** ON A/C NOT FOR ALL

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

Subtask 36-12-52-865-054-A ** ON A/C NOT FOR ALL

D. 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
49VU	AIR BLEED/X FEED/VALVE/BAT	2HV	D13
49VU	AIR BLEED/ENG 1/CTL	3HA1	D12
49VU	AIR BLEED/ENG 1/MONG	2HA1	D11
122VU	AIR BLEED/ENG 2/CTL	3HA2	Z23
122VU	AIR BLEED/ENG 2/MONG	2HA2	Z22
122VU	AIR BLEED/X FEED VALVE/NORM	1HV	Z20

[Rev.10 from 2021] 2026.04.01 01:15:46 UTC