22-11-01
 ú ú 01 Page 13 ú Nov 12/00
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
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A 737-300/400/500MAINTENANCE MANUAL
The HEADING display and concentric rotary selectors provide AP/FD preset heading data. The smaller concentric knob selects the HEADING and the larger knob selects the BANK LIMIT. The output signal from the HEADING control is sent to the FCC, which processes the signal for use by the DFCS. The HEADING control knob provides 360 degrees of heading setting per revolution. Each knob detent provides 1 degree of heading setting. The associated HEADING indicator is actuated by the MCP. The heading data is in digital format for use by the FCCs and analog format for use by the HSI's. The BANK LIMIT control is a 5-position switch for selection of desired bank angle limit in 5-degree steps between 10 and 30 degrees. The selected bank angle limit is overridden for localizer mode.The COURSE displays and controls provide VHF navigation course control for A/P and F/D systems. The left display and control knob interface with FCC A and the captain's EHSI. The right display and control interface with FCC B and the first officer's EHSI. The encoder output signal from the control is sent to the FCC which processes the signal for use by the DFCS. In addition, the COURSE control knob positions a synchro resolver whose output is sent to the VHF NAV receiver. The interface to analog flight instruments is via synchros mounted on the same shaft as the encoder and resolver. The COURSE control knob provides 360 degrees of course setting per knob revolution. Each knob detent provides 1 degree of course setting. The associated COURSE indicator is set directly by the MCP.ALL EXCEPT AIRPLANES WITH -932 AND ON MCP; The ALTITUDE display and control provides altitude data for use by DFCS, altitude alert system, and flight management computer (FMC) system. The display readout is from 0 to 50,000 feet and is adjusted by the control knob in increments of 1000 feet with the knob in the normal position and in increments of 100 feet when the knob is pressed in. The display readout is 10,000 feet at initial system turn on.AIRPLANES WITH -932 AND ON MCP; The ALTITUDE display and control provides altitude data for use by DFCS, altitude alert system, and flight management computer (FMC) system. The display readout is from 0 to 50,000 feet and is adjusted by the control knob in increments of 100 feet. The altitude window is at the altitude knob value at initial system turn on. If power-up test fails 7 times, the displays will go inactive and the altitude window will display 50,000 feet.The VERTICAL SPEED (V/S) display and control provides climb and descent reference by synchronizing at point of mode engagement, or by adjusting thumbwheel control after engagement. The V/S can display between + 6000 feet/minute and - 7900 feet/minute in increments of 100 feet/minute above | 1000 feet/minute and increments of 50 feet/minute below | 1000 feet/minute. The display is blank when V/S mode is not selected or armed.
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 22-11-01
 ú ú 01 Page 14 ú Mar 12/00
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 737-300/400/500MAINTENANCE MANUAL
 4.  Automatic Flight Controls (AFC) Accessory Unit or Integrated Flight System__________________________________________________________________________ Accessory Unit (IFSAU)______________________
 A.  The purpose of the AFC accessory unit or Integrated Flight System Accessory Unit (IFSAU) is to provide an interface between the DFCS and the airplane. It contains devices (relays and transformers) necessary to perform this function.
 B.  AIRPLANES WITH AFC ACCESSORY UNIT; The AFC accessory unit is mounted on the E1-3 shelf in the electrical and electronic equipment bay. The unit is a 3/8 ATR long unit which is retained in the rack by a camlock handle which engages in a rack-mounted adjustable swivel bolt. Electrical connections are provided by a DPX connector on the rear of the unit which mates with a rack-mounted connector.
 C.  AIRPLANES WITH IFSAU; The IFSAU is mounted on the E1-3 shelf in the electrical and electronic equipment bay. The unit is a 3/8 ATR long unit which is retained in the rack by a camlock handle which engages in a rack-mounted adjustable swivel bolt. Electrical connections are provided by two DPX2 connectors on the rear of the unit which mate with rack-mounted connector.
 D.  The unit contains several relays, time delay gates, a circuit interrupter and other components used for interconnecting the DFCS.
　
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