WARNING: MAKE SURE PRESSURE IS REMOVED FROM HYDRAULIC SYSTEMS. MAKE SURE HYDRAULIC POWER AND ELECTRICAL POWER ARE NOT SUPPLIED. IF HYDRAULIC PRESSURE IS PRESENT OR HYDRAULIC / ELECTRICAL POWER IS SUPPLIED, THE FLIGHT CONTROL SURFACES CAN MOVE. THIS CAN CAUSE INJURY TO PERSONS OR DAMAGE TO EQUIPMENT.
(2)
Remove power from the electrical system (Ref 24-22-0 MP).
B. Visually check to determine that all dischargers are secure on mounting base and are not broken or missing.
C. Check dischargers for lightning damage as evidenced by a burning and roughening of the black conductive coating of the discharger and pitting of the metal discharger base.
D. Check for excessive erosion of discharger needles.
E. Check for excessive erosion of the discharger coating. Leading edge erosion of the dischargers should not extend back more than one-third the width of the discharger.
F. Check electrical bond between base and airplane structure per 20-22-01. Resistance for existing installations should not exceed:
0.05 ohms for dischargers mounted on metal panels.
0.5 ohms for dischargers mounted on fiberglass laminate or composite panels coated with aluminum flame spray and dischargers mounted on aluminum coated glass fabric.
5.0 ohms for dischargers mounted on composite panels without aluminum coating.
WARNING: MAKE SURE THAT THE BONDING METER IS RESISTANT TO EXPLOSION. IF NOT IT IS POSSIBLE THAT AN EXPLOSION OR FIRE CAN OCCUR.
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G. Use these precautions for possible fuel vapors when you use a megohmeter:
WARNING: USE THE PRECAUTIONS THAT FOLLOW WHEN YOU USE A MEGOHMMETER. IF YOU DO NOT USE PRECAUTIONS, THEN IT IS POSSIBLE THAT AN EXPLOSION OR FIRE CAN OCCUR.
(1)
Use the Quadtech 1863 megohmmeter or equivalent meter with a 500 VDC test voltage and a maximum 5 milliampeter short circuit current.
(2)
Do not use a megohmmeter at these locations:
(a)
Area adjacent to or below a wing fuel tank vent, five foot (1.524 meters) diameter column, from vent to ground.
(b)
Zero to 18 inches (457 mm) above the ground in the area around the airplane.
(c)
Make sure that:
1) Area is well ventilated.
2) Metal workstands are grounded.
3) Megohmmeter is plugged into a grounded receptacle.
4) Megohmmeter is insulated from metal work stands.
H. Measure, for all dischargers, the resistance between the end of discharger tip and the discharge base using a megohmmeter of at least 500 volts. To make a good surface contact with the end of the discharger tip, wet a paper towel, cotton cloth or sponge with tap water and place in contact with entire surface of end of discharger tip. Place megohmmeter leads on base and on wet material at end of tip. If reading is high, verify that the wet material is adhering to the meter lead and to the end of the discharger tip. Add more water if necessary and measure again. Take lowest reading.
(1) Discharger resistance shall be within the limits of 6-100 megohms for trailing edge and tip types of dischargers.
NOTE: Dischargers failing to meet the resistance check should be replaced.
I. Dischargers exhibiting any damage or failure to meet the resistance check requirements should be replaced.
J. Put the airplane back to its usual condition.
(1) Put the hydraulic systems for the flight control surfaces back to the usual condition (Ref 27-11-0 MP, 27-21-0 MP, 27-31-0 MP).
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VOICE RECORDER SYSTEM - DESCRIPTION AND OPERATION
1. General (Fig. 1)
A. 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 separate inputs for simultaneous recording of any communications in the flight compartment on 4-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 pickup in the voice recorder control panel.
B. The voice recorder system (Fig. 1) consists of a voice recorder unit installed on the right side of the airplane in the aft cargo compartment; a voice recorder control panel installed in the pilots' overhead panel P5; interconnecting wiring; and relay contacts in landing gear accessory unit module M338.
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