______________________
 A. Referenced Information
 -------------------------------------------------------------------------------REFERENCE DESIGNATION -------------------------------------------------------------------------------
21-55-41-000-001 Removal of the Emergency Ram-Air Check-Valve 4022HM 21-55-41-400-001 Installation of the Emergency Ram-Air Check-Valve 4022HM
 3. Job Set-up
__________ Subtask 21-55-41-020-051
 A. Remove the emergency ram-air check-valve (Ref. TASK 21-55-41-000-001).
 4. Procedure
_________ Subtask 21-55-41-210-052
 A. Detailed Visual Inspection of the Check Valve Flappers
 (1)
 Make sure that the check valve is clean.

 (2)
 Make a full visual inspection of the valve-flappers and their seats, the hinge pin and the return spring of the valve-flappers for signs of cracks, dents, marks or corrosion.

 (3)
 Make sure that the valve-flappers operate correctly on their hinge pin. To do this, move them by hand. Also make sure that the valve-flappers touch their seats correctly.

 5. Close-up
________ Subtask 21-55-41-420-051
 A. Install the emergency ram-air check-valve (Ref. TASK 21-55-41-400-001).

 ACTUATOR - EMERGENCY RAM AIR INLET (7HZ) - REMOVAL/INSTALLATION
_______________________________________________________________
 TASK 21-55-51-000-001
 Removal of the Emergency Ram Air Inlet Actuator (7HZ)

 1.
 Reason for the Job

__________________
 Self Explanatory

 2.
 Job Set-up Information

______________________
 A. Fixtures, Tools, Test and Support Equipment
 -------------------------------------------------------------------------------REFERENCE QTY DESIGNATION -------------------------------------------------------------------------------
No specific blanking caps
 No specific circuit breaker(s) safety clip(s)
 No specific access platform 0.50 m (1 ft. 8 in.)

 B. Referenced Information
 -------------------------------------------------------------------------------REFERENCE DESIGNATION -------------------------------------------------------------------------------
24-42-00-861-001  Energize the Ground Service Network from the External Power 21-55-51-991-001 Fig. 401
 3. Job Set-up
__________ Subtask 21-55-51-861-050
 A. Energize the ground service network
 (Ref. TASK 24-42-00-861-001).

 Subtask 21-55-51-865-050
 B. Open, safety and tag this(these) circuit breaker(s):
 -------------------------------------------------------------------------------PANEL DESIGNATION IDENT. LOCATION -------------------------------------------------------------------------------49VU AIR COND/RAM/AIR/INLET 1HZ D10

 Subtask 21-55-51-010-050
 C. Get Access
 (1)
 Put the access platform in position at the access panel 191AB.

 (2)
 Remove the access panel 191AB.

 4. Procedure
_________
 (Ref. Fig. 401/TASK 21-55-51-991-001) Subtask 21-55-51-020-050
 A. Removal of the Actuator
 (1)
 Disconnect the bonding strip (9)

 (a)
 Remove the nut (8).

 (b)
 Remove the screw (11) and the washer (10).

 (2)
 Disconnect the electrical connector (16).

 (3)
 Put blanking caps on the disconnected electrical connectors.

 (4)
 Remove and discard the cotter pins (1).

 (5)
 Remove the nut (13) and the washer (12).

 (6)
 Remove the bolt (14).

 (7)
 Remove the nut (2) and the washer (3).

 (8)
 Hold the actuator (15) and remove the bolt (5) and the washer (4).

 (9)
 Remove the actuator (15), the bushings (6) and the washers (7).

 Emergency Ram Air Inlet Actuator
 Figure 401/TASK 21-55-51-991-001
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 TASK 21-55-51-400-001
 Installation of the Emergency Ram Air Inlet Actuator (7HZ)

 1.
 Reason for the Job

__________________
 Self Explanatory

 2.
 Job Set-up Information

______________________
 A. Fixtures, Tools, Test and Support Equipment
 -------------------------------------------------------------------------------
REFERENCE QTY DESIGNATION
　
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