D.  
Prepare for the Operational Test

 S 865-021
 WARNING:_______OBEY THE REMOVAL PROCEDURE FOR THE DOOR LOCKS. THE DOORS OPEN AND CLOSE QUICKLY. THE MOVEMENT OF THE DOORS CAN CAUSE INJURIES TO PERSONS AND DAMAGE TO EQUIPMENT.
 (1)  
Remove the door locks from the landing gear doors and close the landing gear doors (AMM 32-00-15/201).

 S 495-004

 (2)  
Make sure the downlocks for the nose and main landing gear are installed (AMM 32-00-20/201).

 S 865-005

 (3)  
Lift the airplane on jacks to a height sufficient for landing gear retraction (AMM 07-11-01/201).

 S 865-006

 (4)  
Make sure these circuit breakers on the overhead circuit breaker panel, P11, are closed:

 (a)  
11S15, AIR/GND SYS 1

 (b)  
11S19, AIR/GND SYS 2

 (c)  
11S20, LEVER LOCK

 (d)  
11P29, R IND LTS 2

 32-32-00
 ALL  ú ú 01 Page 501 ú May 28/01
 
A

757 MAINTENANCE MANUAL
 S 865-007
 (5)  
Make sure the control lever for the landing gear is in the DN position.

 S 095-008

 (6)  
Remove the downlocks from the nose and main landing gear
 (AMM 32-00-20/201).

 S 865-009

 (7)  
Pressurize the left hydraulic system to 3000 psi (2800 minimum to 3150 maximum) (AMM 29-11-00/201).

 S 865-010

 (8)  
Supply electrical power (AMM 24-22-00/201).

 S 865-001
 WARNING: MAKE SURE THAT PERSONS AND EQUIPMENT ARE CLEAR OF THE MAIN AND
_______ NOSE LANDING GEAR. INJURY TO PERSONS OR DAMAGE TO EQUIPMENT CAN RESULT.
 (9)  
Retract and extend the landing gear at least three times before you do the test that will measure the landing gear extension and retraction times. This will remove air from the system.

 S 865-002

 (10)
 Make sure the control lever for the landing gear is in the DN position.

 E.
Do a Test of the Main Landing Gear Time to Operate and Reversal

 S 715-022
 WARNING: MAKE SURE THAT PERSONS AND EQUIPMENT ARE CLEAR OF THE MAIN AND
_______ NOSE LANDING GEAR. INJURY TO PERSONS OR DAMAGE TO EQUIPMENT CAN RESULT.
 (1)  
Measure the time it takes to retract the gear.

 (a)  
Start the time when the control lever is moved to UP.

 (b)  
Move the control lever from DN to UP in 2 | 1 seconds.

 (c)  
Make sure the amber DOORS light comes on while the gears move from down to up, and then goes off.

 32-32-00
 ALL  ú ú 02 Page 502 ú May 20/98
 
A

757
MAINTENANCE MANUAL

 NOTE: GUN 206;
____ the amber DOORS light can go off before the amber GEAR light goes off.
 (d)  
Stop the time when the amber DOORS light goes off.

 (e)  
Write down the retraction time.

 S 715-012
 (2)  
Do a check of gear reversal.

 (a)  
Move the control lever from UP to DN. When gear extension is approximately 50 percent complete, move the control lever back to UP at a constant rate in 3 | 1 seconds.

 (b)  
Make sure the landing gear changes direction with no hydraulic leakage or damage to parts.

 (c)  
Move the control lever to OFF.

 (d)  
Make sure the landing gear doors stay in the closed position.

 S 715-013
 (3)  
Measure the time it takes to extend the gear.

 (a)  
Put one person outside the airplane near the main landing gear to monitor gear extension time. Supply interphone communication to the flight deck.

 (b)  
Start the time when the control lever is moved to DN.

 (c)  
Stop the time when the main landing gears are down and locked and the doors close.

 (d)  
Write down the extension time.

 S 715-014
 (4)  
Do a check of gear reversal.

 (a)  
Move the control lever from DN to UP. When retraction is approximately 50 percent complete, move the control lever back to DN at a constant rate in 3 | 1 seconds.

 (b)  
Make sure the landing gear changes direction with no hydraulic leakage or damage to parts.

 S 715-015
 (5)  Compare the time it takes to operate the gear to the limits shown below:
　
中國航空網 m.k6050.com
航空翻譯 www.aviation.cn
本文鏈接地址：757 AMM 飛機維護手冊 起落架 CHAPTER 32 - LANDING GEAR 2(44)