757 AMM 飞机维护手册 STANDARD PRACTICES - AIRFRAME(83)

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 *[1]  The ADF system uses shielded-pair antenna lines for each antenna (sense,
 loop-sin, and loop-cosin). Use the same procedure to do a test of each
 pair as is used for a single coax line. To do a test of the antenna
 cables, use the Rack and Breakout Box connection/test points that follow:
 ~.......................... |SENSE |B (D1 and D2) | ............................ |LOOP-SIN |B (D7 and D8) | ............................ |LOOP-COS |B (D14 and D15)| 2..........…...............1
 *[2]  These cable lengths do not include the length of the test lead adapter cable. You must add this length.
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 *[3]  G/S and LOC antennas each have two types of cables. From the receiver to the E/E rack disconnect panel, BA5903 is used. From the disconnect panel to the antenna, BA14349 is used. The cable lengths are shown adjacent to the applicable cable. A small change in continuity can possibly be seen at the rack connector.
 *[4] GUN 009-999 *[5] GUN 001-008
 S 962-031
 (4)  If the VSWR is 2.0:1 or larger, find and repair or replace the defective cable, connectors or antenna as necessary.
 NOTE: Faults occur more frequently in the coaxial connectors or
____ waveguide joints. When a fault location is near a connector or joint, the fault is usually in the connection.
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150 FEET
50^ CABLE

TDREND OFCONNECT 50^ CABLE CONNECTOR

BC  D SHIELDABRASION(100 FEET)

200 FEET
100 FEET

75^ CABLE

CRIMPED CABLE  SHORTED CABLE

 

FRAYED CABLE  CUT CABLE
CABLE PROBLEM SIGNATURES(EXAMPLE)
SIGNATURE FROM 145 FEET TO 195 FEET WITH CSIGNATURE OF TOTAL SCALE
RECONNECTED SHOWING CONTINUITY DROP AT (SCALE = 50 FEET PER DIVISION)
C AND IMPEDENCE RISE FROM B
(SCALE = 5 FEET PER DIVISION)

CABLE PROBLEM(EXAMPLE)
Time Domain Reflectometer (TDR) Example DisplaysFigure 201
A41486
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 HARTWELL TYPE LATCHES - ADJUSTMENT/TEST
_______________________________________
 1.  General
_______
 A.  This procedure contains two tasks. The first is testing Hartwell latches. The second is adjusting Hartwell latches.
 B.  Hartwell type latches are used on small flush-fitting service access doors such as those for the potable water and lavatory service panels and the forward and mid drain mast access doors.
 TASK 20-10-34-705-005
 2.  Test Hartwell Latches, Series 5100
__________________________________
 A.  Procedure
 S 725-002
 (1)  Test Hartwell series 5100 latches.
 (a)  
Check that door turns freely to within +0.100 or -0.030 inch of contour at latch position.

 (b)  
The latch you want to check, press door to fit and come in line at door edge as shown in Fig. 501. Lock latch and check that preload is there by pushing latch bolt at location mentioned in Fig. 501. There must be 0.010 to 0.030 inch depression free play at this point. Adjust per par. 3 if you do not get free play.

 (c)  
Check that door latch bolt overlap on structure to be 0.25 inch as shown in Fig. 501.

 TASK 20-10-34-825-006
 3.  Adjust Latches______________(Fig. 501)
 A.  Procedure
　
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