737 Flight Crew Operations Manual
Flight Instruments, Displays -
PFD/ND – System Description
Boeing Proprietary. Copyright © Boeing. May be subject to export restrictions under EAR. See title page for details.
D6-27370-866-EGP 10.21.15
Standby Radio Magnetic Indicator
The standby Radio Magnetic Indicator (RMI) displays magnetic and VOR/ADF
bearing to the station. The RMI is powered by the AC standby bus and remains
powered after the loss of all normal AC power as long as battery power is
available.
Clocks
Two electronic clocks are installed in the flight deck, each clock has 2 digital
displays with time or date set on the upper display, and elapsed or the chronograph
(ET/CHR) on the lower display. Separate controls are provided for each display.
This clock is a GPS compatible electronic clock and can be initialized using
Coordinated Universal Time (UTC) or Manual Time Mode. Standby 28V DC
power is used when the main 28V DC power is not available. The clock reverts to
standby power when the airplane is powered down. The standby power keeps the
time base but does not provide power for the display, buttons, or output of clock
data. When the airplane is powered up and a valid Global Position System (GPS)
signal is restored, the clock will initialize to UTC time.
If a UTC signal is not valid during initialization and then drops into manual
initialization, but then becomes valid before manual function is started, the clock
will revert back to UTC mode. If a UTC signal becomes valid after manual
function is started or completed, UTC time can be selected by using the
TIME/DATE button.
Flight Recorder (DFDR)
The Digital Flight Data Recorder (DFDR) provides a permanent record of
operational and systems information including time, heading, altitude, airspeed,
acceleration, attitude, engine thrust, and flight control surface position.
The recorder is a solid state device and complies with Federal Aviation
Administration and European Aviation Safety Agency requirements for data
sampling rates and number/type of parameters sampled.
Operational and systems information are automatically recorded whenever the
flight recorder is powered.
The DFDR has the following features:
• Continuously records the most recent flight data, saving the most
current data for the last 25 hours of operation
• The DFDR is housed in a sealed container located behind an access door
in the far aft cabin ceiling
• Corrosion, fire and impact resistant, survives deep sea pressure to
13,451 feet (4,100 m)
September 26, 2013
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