NOTE: The shuttle valve may trap pressure between the main and standby hydraulic systems, causing a delay in ISOLATION VALVE light illumination. The delay may be reduced by de-energizing the isolation valves for approximately 10 seconds by opening and then closing both THRUST REV circuit breakers.
(c)
Momentarily depress the AIR SENSING TEST switch on the M338 module. Module located on E3 shelf of the electronic rack. 1) ISOLATION VALVE, MASTER CAUTION and OVHD annunciator lights shall
extinguish.
(d)
Lower airplane and monitor ISOLATION VALVE, MASTER CAUTION and OVHD annunciator lights as nose gear strut compresses. ISOLATION VALVE light shall illuminate within initial 2.7 inches of nose gear strut compression from the fully extended position; MASTER CAUTION and OVHD annunciator lights shall illuminate after time delay of approximately 12 seconds.
(e)
Place landing gear selector lever in DOWN position. ISOLATION VALVE, MASTER CAUTION and OVHD annunciator lights shall go out.
(f)
Momentarily depress the GROUND SENSING TEST switch on the M338 module. ISOLATION VALVE light will remain off.
(g)
Place landing gear selector lever in OFF position. ISOLATION VALVE light shall come on and, after a time delay of approximately 12 seconds, MASTER CAUTION and OVHD annunciator lights shall come on.
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78-32-01 Page 510 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. Oct 20/91
(15) On airplanes equipped with the air-ground switch for the nose gear (SB 78-1050), check the operation of the air-ground sensing system.
(a) Test to make sure that the thrust reversers will deploy when the main landing gear is on the ground. 1) Put the nose landing gear in the air mode.
a) Remove the bolt common to the upper torsion link and the spring cartridge of the nose gear. b) Move the spring cartridge down until the stops on the quadrant and the support fitting are in contact. c) If the airplane is on jacks with the nose landing gear compressed, release the nose gear. 2) Test for ground mode.
a) Move the No. 1 reverse thrust lever fully aft. 1 The No. 1 thrust reverser will fully deploy in 2 seconds or less. 2 The No. 1 REVERSER UNLOCKED light will come on.
b) Move the No. 1 reverse thrust lever to the OFF position. 1 The No. 1 thrust reverser will stow in 3 seconds or less. 2 The No. 1 REVERSER UNLOCKED light will go off.
c) Move the No. 2 reverse thrust lever fully aft. 1 The No. 2 thrust reverser will fully deploy in 2 seconds or less. 2 The No. 2 REVERSER UNLOCKED light will come on.
d) Move the No. 2 reverse thrust lever to the OFF position. 1 The No. 2 thrust reverser will stow in 3 seconds or less. 2 The No. 2 REVERSER UNLOCKED light will go off.
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Feb 20/91 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 78-32-01 Page 510A
(b) Test to make sure that the thrust reversers do not deploy while the airplane is in the air mode. 1) Pull out GRD INTER valve circuit breaker C353 on P6-2 panel. 2) Put the right main landing gear in the air mode.
a) Remove the bolt that connects the upper and the lower torsion links of the
right main landing gear.
b) Move the upper torsion link down until the push-pull cable is fully extended.
c) If airplane is on jacks, release the right main landing gear.
3) Test for air mode.
a) Move the No. 1 reverse thrust lever fully aft.
1 The No. 1 thrust reversers will remain stowed.
2 The No. 1 REVERSER UNLOCKED light will remain off.
b) Move the No. 1 reverse thrust lever to the OFF position.
c) Move the No. 2 reverse thrust lever fully aft.
1 The No. 2 thrust reversers will remain stowed.
2 The No. 2 REVERSER UNLOCKED light will remain off.
d) Move the No. 2 reverse thrust lever to the OFF position.
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78-32-01 Page 510B BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. May 01/03
(c) Test to make sure that the thrust reversers will deploy when the nose landing gear is on the ground. 1) Put the nose in the ground mode.
a) Install the bolt common to the upper torsion link and the spring cartridge on the nose landing gear. b) If the airplane is on jacks, compress the nose landing gear. 2) Test for ground mode.
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