(3)
Verify all INST XFMR and INST XFR circuit breakers are closed.
(4)
Tune both VHF NAV receivers to a VOR frequency other than local VOR station.
(5)
Position VHF NAV, COMPASS and VERTICAL GYRO transfer switches to NORMAL.
NOTE: The NORMAL position of transfer switches implies captain on 1 ond first officer on 2.
C. Indicator Power On Test
(1)
Open applicable INST XFMR circuit breaker (Ref step. 2.A). Check compass (heading) warning flag appears and NAV-VOR/ILS annunciator displays NAV.
(2)
Close circuit breakers. Check compass (heading) warning flag retracts and NAV-VOR/ILS annunciator displays VOR/ILS.
(3)
If no further tests are required, remove electrical power.
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D. Indicator Radio Navigation Displays Test.
(1)
Perform prepare to test procedure (Par B). Check HSI for following:
(a)
Compass card displays same heading as appropriate RMI or RDDMI.
(b)
Compass heading flag is out of view.
(c)
NAV-VOR/ILS annunciator displays VOR/ILS.
(d)
Data source annunciator display agrees with VHF NAV transfer switch position.
(e)
GS flag and pointer are out of view.
(f)
NAV flag in view.
(2)
Using appropriate compass controller perform following:
(a)
DG/SLAVED switch - SLAVED.
(b)
SET knob - Turn left. Check HSI compass card rotates smoothly counter-clockwise.
(c)
SET knob - Turn right to return compass card to airplane heading. Check for smooth clockwise rotation.
(3)
On flight director control panel, perform following:
(a)
HEADING knob - Rotate until airplane heading is displayed in HEADING window. Check HSI heading marker is under lubber line.
(b)
Appropriate COURSE knob - Rotate until airplane heading is displayed in COURSE window. Check HSI course arrow is aligned with lubber line.
(4)
Position VHF NAV transfer switch to BOTH ON 1 or BOTH ON 2 as appropriate. Check HSI data source annunciator agrees with selected switch position.
(5)
Return transfer switch to normal.
(6)
On VHF NAV control panel, activate VOR self-test while checking HSI for following:
(a)
After 3 seconds NAV flag goes out of view.
(b)
Course deviation bar remains centered.
(c)
To - From pointer indicates from.
(7)
While continuing VOR self-test, rotate COURSE knob 5 degrees left and 5 degrees right of airplane heading. Check HSI deviation bar deflects 1 dot left and 1 dot right of center.
(8)
Release VOR self-test. Check NAV flag comes into view.
(9)
Tune VHF NAV system to an ILS frequency other than local station. Check HSI GS flag and pointer come into view.
(10)
On VHF NAV control panel, activate ILS UP/LT self-test while, checking HSI for following:
(a)
After 3 seconds NAV and GS flags go out of view.
(b)
Course deviation bar deflect left.
(c)
Glide slope pointer deflects up.
(11)
Release ILS UP/LT self-test. Check NAV and GS flags come into view.
(12)
Return all switches to normal.
(13)
Remove external electrical power if no longer required.
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FLIGHT DIRECTOR (STEERING) COMPUTER - REMOVAL/INSTALLATION
EFFECTIVITY
Airplanes with Collins FD-110 Flight Director System Installed
1. General
A. The flight director steering computers are installed on shelf No. 2 of electronic equipment rack E1.
B. Each computer is held in the rack by a swivel bolt mounted on the equipment shelf.
2. Remove Computer
A. Open applicable Flight Director AC and DC circuit breakers on P6 or P18 circuit breaker panel.
B. Loosen swivel bolt and remove computer.
3. Install Computer
A. Install computer and secure in rack.
4. Test Steering Computer
A. Equipment and Materials
(1) Test Set, Instrument Flight Research Type NAV 401L
B. Prepare to test.
(1)
Provide external electrical power.
(2)
Close following circuit breakers on panels P6 and P18:
