S 735-016
(2)
Do a Test of Alternate Extension with the Control Lever in the OFF Position:
(a)
Do the steps in the Prepare for Alternate Extension Test paragraph.
WARNING: MAKE SURE THAT PERSONS AND EQUIPMENT ARE CLEAR OF THE AREA
_______ AROUND THE NOSE AND MAIN LANDING GEAR. THE DOORS AND THE LANDING GEAR MOVE QUICKLY AND CAN CAUSE INJURY TO PERSONS OR DAMAGE TO EQUIPMENT.
(b)
Move the control lever for the landing gear to the UP position to retract the landing gear. 1) Move the control lever to OFF when the landing gear are up
and locked.
(c)
Remove the pressure from the left hydraulic system
(AMM 29-11-00/201). Make sure the pressure is less
than 200 psig.
NOTE: You can operate the flight controls to make sure that
____ hydraulic pressure is less than 200 psig.
(d)
Make sure the landing gear doors stayed closed and locked.
(e)
Move the control lever to the DN position.
(f)
Make sure the landing gear doors stay in the locked position.
(g)
Move the control lever to the OFF position.
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WARNING: MAKE SURE THAT PERSONS AND EQUIPMENT ARE CLEAR OF THE AREA
_______ AROUND THE NOSE AND MAIN LANDING GEAR. THE LANDING GEAR AND DOORS MOVE QUICKLY AND CAN CAUSE INJURY TO PERSONS OR DAMAGE TO EQUIPMENT.
CAUTION: DO NOT HOLD THE "ALTN GEAR EXTENSION" SWITCH IN FOR MORE
_______ THAN TWO SECONDS. IF YOU HOLD THE SWITCH IN FOR MORE THAN TWO SECONDS, THE POWER PACK CAN BECOME TOO HOT. THE ALTERNATE EXTENSION SYSTEM WILL NOT OPERATE IF THIS OCCURS.
CAUTION: DO NOT TRY TO RETRACT THE LANDING GEAR FOR 2 MINUTES AFTER
_______ AN ALTERNATE EXTENSION. THIS CAN CAUSE POSSIBLE DAMAGE TO THE ACTUATOR CRANK OF THE ALTERNATE UPLOCK RELEASE ACTUATOR IF IT HITS THE DRAG STRUT.
(h)
Open this circuit breaker on the main power distribution panel, P6: 1) 6F5, LANDING GEAR ALTN EXT CONT
(i)
Operate the ALTN GEAR EXTENSION switch, that is found below the control lever.
(j)
Make sure that the landing gear doors and the landing gear do not move.
(k)
Close this circuit breaker on the main power distribution panel, P6: 1) 6F5, LANDING GEAR ALTN EXT CONT
(l)
Operate the ALTN GEAR EXTENSION switch, that is found below the control lever. Hold it for approximately 2 seconds.
(m)
Make sure the landing gear doors open and the landing gear extend to the down and locked position.
NOTE: The landing gear tires can touch the doors during
____
the steps that follow.
1) Monitor the time between operation of the switch and when the green DOWN lights (left and right) come on. Make sure it is less than 30 seconds. The lights are on the P3-1 panel.
2) Make sure the nose landing gear extends to the down and locked position. Apply less than 50 pounds force to the tires to help it into the down and locked position.
3) Make sure the nose green DOWN light on the P3-1 panel comes on.
4) Make sure the amber DOORS light on the P3-1 panel is on.
NOTE: The DOORS light shows that the door position
____ disagrees with the position of the landing gear control lever.
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(n)
At the same time, move the ALL DOORS OPEN ARM switch to ARM and the ALL DOORS OPEN switch to OPEN. Hold them for approximately 2 seconds. The switches are on the P72 panel.
(o)
Make sure the EICAS message, LDG GEAR MONITOR, does not show on the bottom display after 30 seconds. 1) Make sure the power pack for the alternate extension system
does not operate.
(p)
Pressurize the left hydraulic system (AMM 29-11-00/201).
(q)
Move the control lever for the landing gear to the DN position.
WARNING: MAKE SURE THAT PERSONS AND EQUIPMENT ARE CLEAR OF THE AREA
_______ AROUND THE MAIN LANDING GEAR. THE DOORS CLOSE QUICKLY AND CAN CAUSE INJURY TO PERSONS OR DAMAGE TO EQUIPMENT.
(r)
Prepare to measure the time to close the doors for the left and right main landing gear.
(s)
Make sure you wait at least 2 minutes after the landing gear extends before you try to close the landing gear doors.
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