MECHANISM - LATCH - REMOVAL/INSTALLATION________________________________________
 TASK 52-51-21-000-001
 Removal of the Latch Mechanism
 1. Reason for the Job__________________
 Self Explanatory
 2. Job Set-up Information______________________
 A. Fixtures, Tools, Test and Support Equipment
 -------------------------------------------------------------------------------REFERENCE QTY DESIGNATION -------------------------------------------------------------------------------
No specific  circuit breaker(s) safety clip(s)
 B. Referenced Information
 -------------------------------------------------------------------------------REFERENCE DESIGNATION -------------------------------------------------------------------------------
R R R 52-51-21-991-001-B  Fig. 401 
3. Job Set-up__________
 Subtask 52-51-21-010-050
R  A. Get access to the cockpit. 
Subtask 52-51-21-865-050
 B. Open, safety and tag this(these) circuit breaker(s):
 -------------------------------------------------------------------------------PANEL DESIGNATION IDENT. LOCATION -------------------------------------------------------------------------------122VU DOORS/PAX/MONG 1MQ 13 T

R
 4. Procedure_________ 
R R R (Ref. Fig. 401/TASK 52-51-21-991-001-B) 
Subtask 52-51-21-020-050-C
 A. Removal of the Latch Mechanisms
 (1) Remove the two tie-rods (4) and (10) as follows:
 (a) Remove the fasteners (15), the plugs (27), the screws (17), the washers (26) and the cover (16).
 (b) Remove the fasteners (15), the plugs (29), the screws (13), the washers (28) and the cover (14).
 (c) Remove the plugs (7), the screws (8) and the washers (25) from the center latch mechanism (5).
 (d) Remove the screws (9) and the cover plate (6) from the center latch mechanism (5).
 (e) Remove and discard the cotter pins (23) at each end of the tie-rods (4) and (10).
 (f) Remove the washers (22), the bushes (19) and the clevis pins (18) from the levers (24).
 (g) Remove the center latch mechanism (5) from the door (1).
 (2) Remove the top and bottom latch mechanisms (2) and (11) as follows:
 (a) Remove the screws (3) and the washers (30) from the top latch mechanism (2).
 (b) Remove the top latch mechanism (2) from the door (1).
 (c) Remove the screws (12) and the washers (31) from the bottom latch mechanism (11).
 (d) Remove the bottom latch mechanism (11) from the door (1).

R  Three Latch Mechanism Figure 401/TASK 52-51-21-991-001-B 
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R
 TASK 52-51-21-400-001
 Installation of the Latch Mechanism
 1. Reason for the Job__________________
 Self Explanatory
 2. Job Set-up Information______________________
 A. Consumable Materials
 -------------------------------------------------------------------------------REFERENCE DESIGNATION -------------------------------------------------------------------------------
R  Material No. 19-010  USA AMS 5687 LOCKWIRE STAINLESS STEEL ANNEALED 0.8MM DIA (Ref. 20-31-00)
 B. Referenced Information
 -------------------------------------------------------------------------------REFERENCE DESIGNATION -------------------------------------------------------------------------------
R R R  52-51-21-991-001-B  Fig. 401 

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 3. Job Set-up__________
 Subtask 52-51-21-860-050
R  A. Make sure that the access to the cockpit is available. 
Subtask 52-51-21-865-051
 B. Make sure that this(these) circuit breaker(s) is(are) open, safetied and tagged
 -------------------------------------------------------------------------------PANEL DESIGNATION IDENT. LOCATION -------------------------------------------------------------------------------122VU DOORS/PAX/MONG 1MQ 13 T 
R
 4. Procedure_________ 
R R R (Ref. Fig. 401/TASK 52-51-21-991-001-B) 
Subtask 52-51-21-420-050-C
 A. Installation of the Latch Mechanism
 (1) Clean the component interface and/or the adjacent area.
 (2) Do an inspection of the component interface and/or the adjacent area.
 (3) Put the top latch (2) in position and install the washers (30) and the screws (3).
 (4) Make sure that the edge of the top latch (2) aligns with the edge of the door blade.
　
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