(2)
Observe that OFF light on flight recorder control panel is on.
(3)
Set TEST/NORMAL switch on control panel to TEST position. Check that OFF light goes off.
(4)
Return TEST/NORMAL switch to NORMAL position.
(5)
If no longer required, remove electrical power.
5B8
Jun 20/83 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 31-24-11 Page 401
K70848
Flight Recorder Installation 528
31-24-11 Figure 401 Nov 01/74
Page 402
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.
FLIGHT RECORDER ACCELEROMETER - REMOVAL/INSTALLATION
1. General
A. On airplanes with single-axis accelerometers, the accelerometer detects only vertical acceleration for input to the flight recorder. On airplanes with 3-axis accelerometers, longitudinal acceleration signals are also detected and sent to the flight recorder. The accelerometer is mounted on the aft side of the left wheel well forward bulkhead. Access is through the left wheel well.
2. Remove Flight Recorder Accelerometer
A. Open flight recorder ac and dc circuit breakers on P18-2.
B. Disconnect electrical connector from accelerometer (Fig. 401).
C. Remove four accelerometer mounting screws.
D. Remove accelerometer.
3. Install Flight Recorder Accelerometer
A. Place accelerometer on mounting bracket and secure with mounting screws.
B. Install electrical connector on accelerometer.
4. Test Flight Recorder Accelerometer
A. Connect electrical power and energize load control center P18.
B. Ensure flight recorder ac and dc circuit breakers on P18-2 panel are open.
C. Verify accelerometer operation (Airplanes with analog Fairchild Flight recorder).
(1)
Close flight recorder AC and DC circuit breakers on P18-2 panel.
(2)
Actuate flight recorder test switch on overhead panel. Check that flight recorder failure light on overhead panel goes out.
(3)
Tap accelerometer several times. Check that accelerometer scriber on flight recorder moves as accelerometer is tapped.
(4)
Release flight recorder test switch. Check that failure light on overhead panel comes on.
D. Verify accelerometer operation (Airplanes with Sunstrand Universal Flight Data Recorder (UFDR).
(1)
Connect portable tester (Sundstrand DSDU 981-6301-002) to the front of flight recorder (Ref 31-24-00 adjustment/test).
(2)
Close flight recorder AC and DC circuit breakers on P18-2 panel.
(3)
Select SUBFRAME 0 WORD 2 on portable tester and check that portable tester readout is 3714 to 4064.
(4)
Repeat above for WORDS 10 and 13. Check that portable tester readout is 3714 to 4064 for both WORDS.
E. Verify accelerometer operation (Airplanes with Fairchild Digital Flight Recorder)
(1)
Connect portable tester (AACO FAA-0024-001) to the front of flight recorder (Ref 31-24-00 adjustment/test).
(2)
Close flight recorder AC and DC circuit breakers on P18-2 panel.
(3)
Select SUBFRAME O WORD 9 on portable tester. Check that portable tester readout is between 0000 and 0240. If third digit of octal readout is 2 or 6, BIT 5 will be on (acceleration greater than 1 G). If third digit of octal readout is 0 or 4, BIT 5 will be off (acceleration is 1 G or less).
F. Return airplane to normal.
G. De-energize load control center P18.
H. Remove electrical power if no longer required.
5C8
Jun 20/88 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 31-24-81 Page 401
H30026
Flight Recorder Accelerometer Installation 535
31-24-81 Figure 401 Feb 15/72
Page 402
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.
UNDERWATER LOCATOR BEACON UNIT - MAINTENANCE PRACTICES
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