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A.  The flight recorder provides a permanent record of airplane altitude, airspeed, heading, vertical acceleration and radio transmission recorded rectilinearly on a metal foil tape. Airplane flight parameters, a reference line, trip and date information are scribed on tape moving at a controlled rate. The reference line and controlled tape rate provide an accurate reference and time base from which events may be measured.
B.  Heading information and heading excitation signals are received from the compass system (Ref Chapter 34, Compass Systems). Altitude and airspeed information are provided by the air data computer. A vertical accelerometer provides acceleration information to the recorder.
C.  The recorder is capable of recording: altitudes from -1000 to +50,000 feet, airspeeds from 100 to 450 knots, headings from 0 thru 360 degrees, and accelerations from -3G to +6G. 150-foot magazine capacity and tape speed of 6 inches per hour provide a recording time of 300 hours of recording time between recorder servicing operation. Flight recorder operation will begin as soon as one of the engines is operating and airplane electrical power is available to the circuit breaker panels. The recorder will stop whenever the airplane is on the ground and neither engine is operating. A failure warning light on the test module located on overhead panel P5 provides indication of an inoperative flight recorder.
D.  The flight recorder is installed above the ceiling panels at station 947, left of the airplane centerline. An underwater locator unit is mounted on the flight recorder door. It is a battery powered unit, which actuates immediately upon immersion in water. The accelerometer is installed near the airplane center of gravity on the aft side of the left main wheel well forward bulkhead at station 663. Access to the accelerometer is through the left wheel well. The test module and the trip and date encoder are located on overhead panel P5.
E.  The recorder uses electronic bus 115 volts ac obtained through a circuit breaker on load control center P18. The test module logic circuits use 28 volts dc obtained from the flight recorder dc circuit breaker supplied by the battery bus on load control center P18. The master dimming and caution circuits supply power for the flight recorder failure warning light on the test module (Ref Chapter 33, Control Cabin Lighting).
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Feb 20/85 31-24-01 Page 1

K80766
Flight Recorder System Component Location  504 
31-24-01  Figure 1  Nov 15/79 
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BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 

2.  Flight Recorder Test Module (Fig. 2)
A.  The flight recorder test module contains a flight recorder failure warning light, a test switch, an auto on-off circuit and electronic circuits which are part of the mach warning system and master caution system. Only those components related to the flight recorder system Will be described.
B.  The amber push-to-test flight recorder failure light provides indication of an inoperative flight recorder when illuminated. A ground for the light is completed through a de-energized power relay in the flight recorder whenever power is not available to the flight recorder.
C.  A transistorized auto-on-off circuit and relay complete 115 volts ac power to the flight recorder. The transistor circuit is normally conducting when ground power is on the airplane and the airplane engines are inoperative; the relay is pulled in and power is disconnected to the flight recorder. The relay can become de-energized, thus completing power to the flight recorder, in any one of three ways. Starting either one of the airplane engines causes an engine oil pressure switch to close thus grounding the transistor and causing the relay to open. If the airplane is airborne and both engines should be shut down, a ground is provided through the landing gear and lever latch relays, keeping the transistor circuit grounded and thus the flight recorder still operating. A test switch on the flight recorder test module may be used to operate the flight recorder during ground maintenance checkout.
3.  Trip and Date Encoder (Fig. 2)
A.  The trip and date encoder supplies signals to a trip and date (reference) solenoid actuated scribe in the recorder which scribes the recorder tape in a pulse sequence indicative of the trip and date information. The panel contains a tape time remaining indicator, an EVENT pushbutton, and a REPEAT pushbutton with an integral white light. The panel also contains six manually operated levers which may be used to select a coded trip number of up to four digits and a date number of two digits. Numbers from 0 to 9 may be selected with each control. The unit contains a motor, switching disk assembly, relay and circuitry which develop event, trip and date signals as selected by the front panel controls. The trip and date recording cycle requires 15 minutes. Pressing the REPEAT pushbutton will cause the trip and date information to be recorded and the amber light to be illuminated. Pressing the EVENT pushbutton causes the trip and date (reference) scribe in the recorder to operate for as long as the pushbutton is held. The EVENT button must not be operated while the trip and date data is being recorded.
　
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