Turn the left Stall Warning (AOA) Vane counterclockwise to its top stop and start a stopwatch. Make sure that the leading edge slats extend fully in 4 seconds. IF -
LEADING EDGE SLATS DO NOT EXTEND - Close circuit breaker
NOT OK
NOSE GEAR AIR/GND (P6 panel). Depressurize system A (AMM 29-15-00/201). Loosen in-flow B-nut on either hydraulic fuse located between PTU pressure filter and leading edge control valve. Allow all residual pressure to bleed off. Tighten B-nut.
LEADING EDGE SLATS EXTEND SLOWER THAN 4 SECONDS
1 -
NOT OK
Close circuit breaker NOSE GEAR AIR/GND (P6 panel). Depressurize system A (AMM 29-15-00/201). Service PTU filter (AMM 29-22-21/201).
Do this task: "Leading Edge Autoslat System -
NOT OK
Troubleshooting (AMM 27-83-00/101).
OK
PTU operation is sensitive to hydraulic pressure and may require hose lengths of less than 15 feet between airplane and test stand to minimize pressure drop.
Hydraulic Power Transfer Unit - Troubleshooting Figure 101 (Sheet 1)
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 737-300/400/500MAINTENANCE MANUAL
PROCEDURE 1
PROCEDURE 2
Hydraulic Power Transfer Unit - Troubleshooting
Figure 101 (Sheet 2)
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
HYDRAULIC POWER TRANSFER UNIT (PTU) SYSTEM - ADJUSTMENT/TEST
____________________________________________________________
1. General_______
A. There are two tasks in this procedure, there is an operational test and a system test of the hydraulic power transfer unit (PTU) system. You can use the operational test to find if the PTU is serviceable. You can use the system test to do a full test of the system.
TASK 29-22-00-715-001
2. PTU Operational Test____________________
A. References
(1)
AMM 24-22-00/201, Manual Control
(2)
AMM 29-09-00/201, Hydraulic Reservoir Pressurization System
(3)
AMM 29-15-00/201, Hydraulic System A, B and Standby
B. Access
(1) Location Zone
101, 102 Control Cabin
C. Prepare for the Test
S 865-003
(1)
Supply pressure to the hydraulic reservoirs (AMM 29-09-00/201).
S 865-004
(2)
Supply the electrical power (AMM 24-22-00/201).
S 865-005
(3)
Make sure the two Stall Warning Vanes (Alpha Vanes) are at the zero position.
S 865-006
(4)
Make sure these circuit breakers are closed:
(a) P6 Panel
1) PTU/LG BYP V CONT 1
2) NOSE GEAR AIR/GND
3) AUTOSLAT NO. 1 DC
4) AUTOSLAT NO. 2 DC
S 865-007
(5) AIRPLANES WITH AN AUTOSLAT COMPUTER (P/N 65-52818);
Make sure these circuit breakers are closed:
(a) P6 Panel
1) AUTOSLAT NO. 1 AC
2) AUTOSLAT NO. 2 AC
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 737-300/400/500MAINTENANCE MANUAL
S 865-009
WARNING: KEEP PERSONS AND EQUIPMENT AWAY FROM ALL CONTROL SURFACES AND
_______ LANDING GEAR WHEN HYDRAULIC POWER IS SUPPLIED. THE AILERONS, ELEVATORS, RUDDER, FLAPS, SLATS, SPOILERS, STABILIZER, AND THE LANDING GEAR ARE SUPPLIED WITH POWER BY THE HYDRAULIC SYSTEM. INJURIES TO PERSONS OR DAMAGE TO EQUIPMENT CAN OCCUR WHEN THE HYDRAULIC POWER IS SUPPLIED.
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