discharger bases.
1) Put one lead on the discharger base.
2) Put one lead on the airplane surface.
3) Make sure the resistance for an installed discharger base
is not more than:
a) 0.05 ohms for dischargers installed on metal panels.
b) 0.5 ohms for dischargers installed on fiberglass
laminate or composite panels with aluminum flame spray. c) 0.5 ohms for dischargers installed on a glass fabric that has aluminum layers. d) 5.0 ohms for dischargers installed on composite panels
that do not have an aluminum layer.Method 2 - Use a bonding meter (SWPM 20-20-00) to measure the resistance between two static discharger bases.
NOTE:____Make sure both leads touch bare metal. When a surface is coated with paint scrape off a small amount of paint or use a sharp probe to penetrate the paint.
NOTE: The resistance values are for in-service dischargers.
____ There are different values for newly installed discharger bases.
1) Put one lead on the discharger base.
2) Put the other lead on another discharger base.
3) Make sure the resistance between the two discharger bases
is not more than:
a) 0.10 ohms for dischargers installed on metal panels.
b) 1.0 ohms for dischargers installed on fiberglass
laminate or composite panels with aluminum flame spray. c) 1.0 ohms for dischargers installed on a glass fabric that has aluminum layers. d) 10.0 ohms for dischargers installed on composite panels that do not have an aluminum layer.
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A 737-300/400/500MAINTENANCE MANUAL
(c) (d) Paint the area where paint was removed for the airplane surface resistance test (AMM 51-21-99/701).A discharger that does not have the correct resistance must be replaced (AMM 23-61-00/401).
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A
737-300/400/500MAINTENANCE MANUAL
VOICE RECORDER SYSTEM - DESCRIPTION AND OPERATION
_________________________________________________
1. General (Fig. 1)_______
A. AIRPLANES WITH TAPE VOICE RECORDER; The voice recorder system records and preserves a continuing record of the latest 30 minutes of flight crew communications and conversation. The voice recorder system has four inputs for simultaneous recording of all communications in the flight compartment on four track tape. Channel one receives audio from the first observer's audio selector panel, channel two receives audio from the first officer's audio selector panel and channel three receives audio from the captain's audio selector panel. Channel four audio is taken from a microphone in the voice recorder control panel.
B. AIRPLANES WITH SOLID STATE VOICE RECORDER; The voice recorder system records and preserves a continuous record of flight crew communications and conversations. The voice recorder system records four separate channels simultaneously and stores the data in solid state memory. Channels 1, 2, and 3 receive their audio from the audio management unit: channnel one receives first observer audio, channel two receives first officer audio, and channel three receives the captain audio. Channel four receives audio from a remote microphone in the control panel.
C. The voice recorder system consists of a recorder unit installed on the right side of the airplane in the aft cargo compartment; a control panel installed in the pilots' overhead panel P5; interconnecting wiring; and relay contacts in the landing gear accessory unit Module M338.
D. AIRPLANES WITH TAPE BASED VOICE RECORDER; An erase head in the recorder automatically erases previously recorded information prior to recording. A 30-minute length of closed loop magnetic tape provides a record of the previous 30 minutes of conversation. An internal monitoring circuit ensures proper operation of the recording mechanism and circuits. Audible and visible indications derived from the monitoring circuits are presented at a meter and a jack on the control panel when the test switch on the control panel is operated. The entire tape may be erased after the airplane has landed and the parking brake has been set.
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