(3)  
If no further test are required, remove external electrical power.

5C8
Jun 20/85 34-26-51 Page 401
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.

D.  Control Panel Mode Selection Test
(1)  
Perform prepare to test procedure (par. B).

(2)  
Position mode selector to HDG. Check F/D APD for green HDG SEL annunciation.

(3)  
Rotate left COURSE knob left and right of airplane heading. Check captains HSI course pointer follows course commands.

(4)  
Rotate right COURSE knob left and right of airplane heading. Check F/O's HSI course pointer follows course commands.

(5)  
Rotate HEADING knob left and right of airplane heading. Check on both ADI'S, V-bars follow heading commands, also HSI heading marker follows heading command.

(6)  
Return HEADING knob to airplane heading. Check ADI V-bars are centered and HSI heading marker is under lubber line.

(7)  
Rotate PITCH CMD knob 10 degrees above and below 0. Check on both ADI'S, V-bars follow pitch commands.

(8)  
Return PITCH CMD knob to zero. Check ADI V-bars are centered.

(9)  
Position ALT HOLD ON/OFF to ON, check F/D APD for green ALT HOLD annunciation.

(10)
Rotate PITCH CMD 10 degrees up and return to zero. Check on both ADI'S, V-bars remain centered.

(11)
Position mode selector to MAN GS. Check for following:

(a)  
ALT HOLD switch - Returns to OFF

(b)  
ALT HOLD annunciations -ALT HOLD extinguish
    VOR/LOC green
    GS green

(12)
Momentarily press left thrust lever GO-AROUND switch. Check for following:

(a)
Mode selector - Rotates to GA position.

(b)
F/D APD - annunciations GA green.

(c)
ADI V-bars -display pitch-up command

(13)
Position mode selector to VOR/LOC. Check F/D APD for green HDG and amber VOR/LOC annunciations.

(14)
Position mode selector to OFF.

(15)
Return all switches and controls to normal.

(16)
Remove electrical power if no longer required.

5A5 
34-26-51 Page 402  BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.  May 01/03 

FLIGHT INSTRUMENT ACCESSORY UNIT - REMOVAL/INSTALLATION
1. General
A.  The flight instrument accessory unit is installed on electronic shelf E1-2. The accessory unit is held in the rack mounting by a lever latch assembly. Correct adjustment of the lever latch assembly is necessary to assure proper electrical connector engagement.
2.  Remove Accessory Unit
A.  Open the following circuit breakers on electronic load circuit breaker panel P18:
(1)  For flight instrument accessory unit M160:
(a)  
As installed, HORIZON, INSTRUMENT XFMR 1 and 2, AUTOPILOT ROLL DC, and INSTRUMENT TRANSFER circuit breakers.

(b)  
All circuit breakers for AIR DATA, FLIGHT DIRECTOR, VERTICAL GYRO and VOR/GS systems No. 1 and No. 2.

B.  Depress lever latch release trigger allowing lever to move away from handle.
C.  Move lever in an opening direction forcing unit away from rack electrical connector.
D.  Remove unit from rack mounting.
3.  Install Accessory Unit
A.  Slide accessory unit into rack mounting with lever latch in open position until lever engages rack-mounted fork.
NOTE: Remove any protective caps or bags from the unit or shelf prior to installation.
B.  Move lever latch to locked position (Fig. 401).
C.  Check electrical connector mating dimensions and lever latch fork adjustment per 20-10-111, Electrical/Electronic Black Box - MP.
CAUTION:  IMPROPER ADJUSTMENT OF ASSEMBLIES ON EQUIPMENT SHELVES MAY CAUSE CIRCUIT MALFUNCTION OR EQUIPMENT DAMAGE
510 
Jun 20/90  BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.  34-26-61 Page 401 

G42479
Flight Instrument Accessory Unit Installation  510 
34-26-61  Figure 401  Jun 20/90 
Page 402 
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 

4.  Test Accessory Unit
a.  
After installation, the following test checks for proper mating of the accessory unit electrical connectors. For a complete operational test of either accessory unit, perform the Flight Director System A/T per 34-26-0/501.

B.  
Test Flight Instrument Accessory Unit M160

(1)  
Close the circuit breakers opened in par. 2.A.(1) and circuit breakers for the Indicator Lights and Approach Progress Display (APD) Dim and TEST power.
　
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