(16) On airplanes with a Modification to the Radio Altimeter to Enable the Thrust Reverser (SB 78-1051), check the operation of the radio altimeter enabling system.
(a)
Put airplane in the air mode. 1) Put the main gear in the air mode. a) Remove the bolt common to the upper and lower torsion links of the right main gear. b) Move the upper torsion link down until the push-pull cable assembly is fully extended. c) If airplane is on jacks, release the right main gear.
2) Put the nose gear at a 15-foot altitude. a) Set the radio altimeter No. 1 to a 15 foot altitude (AMM 34-33-( ) A/T).
(b)
Test for air mode.
1) Rotate the No. 1 and the No. 2 reverse thrust levers aft to limit of travel. a) The No. 1 and No. 2 reversers will not deploy. b) The thrust reverser unlocked lights will not come on.
2) Move the No. 1 and No. 2 reverse thrust levers to OFF.
a) The isolation valve light will come on.
(c)
Put the nose gear in the ground mode.
1) Reduce the simulated altitude on the radio altimeter to 8 feet (AMM 34-33-( ) A/T).
(d)
Test for ground mode.
1) Rotate the No. 1 and No. 2 reverse thrust levers aft to the limit of travel. a) Both reversers will deploy after approximately 5 seconds. b) The thrust reverser unlocked lights will come on.
2) Move the No. 1 and No. 2 reverse thrust levers to OFF.
a) Both of the reversers will stow.
b) The thrust reverser unlocked lights will go off.
(e) Put main gear in the ground mode. 1) Install the bolt that is common to both of the upper and lower torsion link of the
right main gear.
2) If airplane is on jacks, compress the right main gear oleo.
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78-32-01 Page 510D BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. Aug 01/94
(17)
On airplanes without nose gear air-ground switch, check operation of the main landing gear air-ground sensing system.
(a)
Place landing gear selector lever in OFF position. ISOLATION VALVE light shall come on and, after time delay of approximately 12 seconds, MASTER CAUTION and OVHD annunciator lights shall come on.
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.
(b)
Momentarily depress the AIR SENSING TEST switch on the M338 module located on E3 shelf of the electronic rack. 1) ISOLATION VALVE, MASTER CAUTION and OVHD annunciator lights shall
extinguish, then illuminate.
(c)
Open engine No. 1 THRUST REVERSER circuit breaker. ISOLATION VALVE, MASTER CAUTION and OVHD annunciator lights shall remain on.
(d)
Open engine No. 2 THRUST REVERSER circuit breaker. ISOLATION VALVE, MASTER CAUTION and OVHD annunciator lights shall remain on.
(e)
Close engine No. 1 THRUST REVERSER circuit breaker. ISOLATION VALVE light shall illuminate and after time delay of approximately 12 seconds, MASTER CAUTION and OVHD annunciator lights shall come on.
(18)
Test Lock Indication
(a)
Move engine No. 1 thrust reverser override switch to OVERRIDE.
(b)
Rotate engine No. 1 reverse thrust lever aft to limit of travel.
1) Engine No. 1 REVERSER UNLOCKED light shall illuminate.
2) Engine No. 1 thrust reverser shall move to the reverse thrust position.
(c)
Move engine No. 1 thrust reverser override switch to NORMAL position.
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