Clocks YA721, YA722
Two electronic clocks are installed, with two digital displays on each clock. Either Greenwich Mean Time (GMT) or local time may be set on the upper time display. The lower ET/CHR display is used for either elapsed time or the chronograph. Separate controls are provided for each display.
Clock Switch YC153, YC154
A remote clock switch, on the glareshield panel, operates the same as the chronograph (CHR) control.
Flight Recorder
The flight recorder provides a permanent record of selected operational and systems information such as altitude, heading, acceleration, and airspeed. The recorder is housed in a sealed, fire–resistant container located behind an access door in the aft cabin ceiling.
Operational and systems information is automatically recorded whenever the flight recorder is powered. On the ground, the recorder begins operating when one of the engines is operating. In the air, the flight recorder is powered even with both engines shut down as long as APU electrical power is available.
Aircraft Condition Monitoring System (ACMS)
The ACMS consists of a digital flight data acquisition unit (DFDAU) and digital
flight data recorder (DFDR).
The DFDAU receives signals representing certain flight condition and airplane
systems’ operating performance and converts them to a digital form for recording
on the DFDR.
The DFDR records airplane systems and flight data for at least the last 25 hours
of operation. The DFDR is located in the aft fuselage area.
Copyright . The Boeing Company. See title page for details.
10.21.16 March 28, 2005
737 Flight Crew Operations Manual
This Section Applies to YC153, YC154
Introduction
The head-up display (HUD) system uses electronics and optics to calculate and display flight information. The flight information is displayed as flight symbols which project on to a transparent glass screen in front of the pilot. The flight symbols overlay and combine with the outside view through window No. 1.
The HUD system can be used during manual flight operations, or with the AFDS engaged during automatic flight operations. When used manually, internal HUD guidance is used to control flight symbology and is independent of any AFDS derived or displayed flight director guidance.
HUD system components, combined with other airplane systems, produce flight symbology displayed in four distinct modes of operation. Each mode of operation has unique characteristics, and is intended to be used during a particular phase of flight based on system capability and meteorological conditions. TCAS resolution advisories and system failure flags are also displayed when active. Detailed information on display symbology is found in Section 42 of this chapter.
The HUD system consists of the following components:
.
HUD computer
.
Overhead unit (OHU)
.
Combiner
.
Control Display Unit (CDU)
.
Annunciator panel
HUD Computer
The HUD computer receives input signals from aircraft sensors and equipment and converts this data to symbology for display on the combiner. The computer also evaluates system and approach performance through extensive input validation and approach monitor processing. If an out of tolerance condition exists, the computer replaces affected symbols with the appropriate annunciation; in severe cases, the system blanks the combiner display.
Overhead Unit (OHU)
The OHU contains the CRT and projection optics to display flight symbology on the combiner. Electronic circuitry within the OHU controls display intensity.
Copyright . The Boeing Company. See title page for details.
Flight Instruments, Displays -Head-Up Display System Description 737 Flight Crew Operations Manual
Combiner
The combiner optically combines flight symbology from the OHU, with the
pilot’s view through window No.1. It acts as a wavelength selective mirror,
reflecting only the flight symbology color (green) and lets other colors pass
through.
The combiner assembly contains a switch that disables the display when the
combiner is not in the normal operating detent.
The combiner glass element has a break away safety feature which allows the
element to rotate forward from the normal position, in case of abnormal
deceleration.
Control Display Unit (CDU)
The HUD computer is controlled via the CDU. The HUD MENU page allows for data entry, selection of HUD modes and test/maintenance functions.
Annunciator Panel
The annunciator panel consists of lights to indicate HUD system status. It enables the first officer to monitor the operation of the HUD.
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