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MAINTENANCE MANUAL
S 424-012
(2) Install the 2 bolts and washers to connect the sequence valve to the wheel well wall. Install the locating fixture in the other mounting hole in the valve.
S 494-013
(3) Put the locating fixture pin through the fitting and the rod end of the valve. This will hold the fitting 3.790 to 3.810 inches from the mounting bolt for the sequence valve.
S 824-014
(4) If possible, install the bolt, washers, bushing, and nut to connect the fitting to the link. If the fitting cannot be connected to the link, do these steps: (a) Remove the bolt to disconnect the rod end from the crank. (b) Connect the fitting to the link. (c) Loosen the jamnut. (d) Adjust the rod end until you can install the nut, washer, and bolt to connect the rod end to the crank.
(e) (f) (g) (h) Tighten the jamnut to 220 to 280 pound-inches.Install lockwire on the jamnut and the locking device.Apply sealant to both sides of the locking device and jamnut.Apply sealant to all the areas of the keyway in the rod end that are in the open.
S 094-015
(5) Remove the locating fixture from the valve.
S 434-016
(6) Install the bolt, washer, and nut to connect the fitting to the rod end of the sequence valve.
S 434-017
(7) Install the bolt and washer to connect the valve to the wheel well wall.
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S 434-018
(8)
Connect the hydraulic lines to the sequence valve.
F.
Do a Check of the Valve for Correct Installation
S 864-019
(1)
Pressurize the left hydraulic system (AMM 29-11-00/201).
S 714-020
(2)
Do the extension and retraction test for the nose landing gear (AMM 32-34-00/501).
S 864-021
(3)
Remove the power from the left hydraulic system if it is not necessary (AMM 29-11-00/201).
S 794-022
(4)
Examine the sequence valve for hydraulic leaks.
G.
Put the Airplane Back to Its Usual Condition
S 614-023
(1) Make sure the fluid in the hydraulic reservoir is at the correct level. Fill if it is necessary (AMM 12-12-01/301).
S 094-024
WARNING: USE THE PROCEDURE IN AMM 32-00-15/201 TO REMOVE THE DOOR LOCKS.
_______ DOORS OPEN AND CLOSE QUICKLY AND CAN CAUSE INJURY TO PERSONS OR DAMAGE TO EQUIPMENT.
(2) Remove the door locks from the landing gear doors and close the doors (AMM 32-00-15/201).
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LANDING GEAR ALTERNATE EXTENSION - DESCRIPTION AND OPERATION
____________________________________________________________
1. General_______
A. Landing gear alternate extension is done by an electrical/hydraulic/mechanical system that operates independently from the normal extension and retraction system. This system releases the locks on the landing gear and doors when the normal hydraulic system does not work. This system is also used to open the landing gear doors for maintenance procedures in or near the wheel well areas.
B. The alternate extension system has the components that follow:
(1)
Alternate extension switch
(2)
Power pack
(3)
Door lock release actuators
(4)
Alternate uplock release actuators
(5)
Door safety valves
(6)
Hydraulic pressure switch.
C.
The door ground operations system has these components (minus the alternate extension switch) plus those that follow:
(1)
Door release interlock actuators
(2)
Door closed switches
(3)
Door locked switches
(4)
Door unsafe lights
(5)
Door ground control switches.
2. Component Details_________________
A. Alternate Extension Switch (Fig. 1)
__________________________
P3-1
CONTROL LEVER
ALTERNATE EXTENSIONSWITCH
Alternate Extension Switch
Figure 1
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(1)
The alternate extension select switch is a toggle switch which has a guard to prevent accidental operation. The switch is installed below the control lever for the landing gear on the pilots' center instrument panel, P3.
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