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23-31-0 Page 102 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. Aug 01/74
PASSENGER ADDRESS SYSTEM - MAINTENANCE PRACTICES
1. General
A. The following is a speaker test that applies to all airplane installation configurations. A random noise input is applied to the microphones and the speaker audio output is measured. This is not a passenger cabin audio level test. The passenger cabin audio level is a function of speaker size and the number of speakers installed in the cabin. Basic airplane design determines the number of speakers installed. If the individual speaker audio level output is within specified tolerances, the passenger cabin audio level will meet minimum requirements.
2. Equipment and Materials
A. Random Noise Generator - Model 543-1, Pacific Electro Dynamics
B. Sound Level Meter - GR-1565-A, General Radio
3. Prepare to Test
A. Provide electrical power to airplane.
B. Check that all interphone and PA system circuit breakers are closed.
4. Test Passenger Address System
A. Closely couple noise generator to sound level meter.
B. Set sound level meter to C weighted scale.
C. Set noise generator PWR/PTT switch to ON and OUTPUT switch to SPKR. Check that sound level meter indicates 100 士1 dbA.
NOTE: If reading is outside tolerance, check batteries of both units. If batteries are good adjust noise generator for correct output.
D. Closely couple noise generator to PA microphone/handset at flight crew station.
E. Press PTT switch on microphone/handset.
F. Closely couple sound level meter to cabin speaker, moving meter across face of speaker for maximum indication on meter.
NOTE: Do not measure output of speaker while meter is in motion as noise generated by movement may give a false indication.
G. With sound level meter set to C weighted scale, check that speaker output is 99 +10-2 dbA.
H. Disconnect D752 at engine no. 1 low oil pressure switch. Check that speaker output level increases by 6 dbA. On airplanes incorporating SB 23-1060, both engine oil pressure switches are connected with the passenger address system amplifier.
I. Reconnect D752. Check that speaker output level returns to reading obtained in step G.
J. Repeat steps D thru G for remaining passenger cabin speakers.
K. Repeat steps D thru G for other PA microphones/handsets.
L. Disconnect test equipment.
M. Remove electrical power if no longer required.
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Jun 20/92 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 23-31-0 Page 201
PASSENGER ADDRESS SYSTEM - ADJUSTMENT/TEST
1. General
A. Paragraph 2 of this section gives the procedure for an operational test of the system. Satisfactory completion of this test will provide assurance that the system is fully operative.
2. Passenger Address System Operational Test
A. Prepare to Test
(1)
Provide electrical power to airplane.
(2)
Check that the following circuit breakers on P6 are closed:
(a)
PA AMPLIFIER
(b)
TAPE REPRODUCER DC
(c)
TAPE REPRODUCER AC
(d)
FLT INPH AMPL
(e)
CAPT & OBS
(f)
F/O & E/R
(3)
Check that the following circuit breakers on P18 are closed:
(a)
PASS SIGN CONTROL
(b)
PASS & CREW CALL
(4)
Turn on captain's and first officer's flight interphone loudspeaker.
B. Test Passenger Address System
(1)
On GUN/XIA B-2501-B-2505, B-2509-B-2512, and B-2514-B-2516, at forward attendant's panel, turn on music and adjust it to a comfortable listening level.
(2)
On GUN/XIA ALL EXCEPT B-2501-B-2505, B-2509-B-2512, and B-2514-B-2516, at prerecorded announcement/boarding music tape reproducer on aft wall of forward passenger lavatory, rotate MUSIC control clockwise to on.
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