1) Make sure that the first officer's PFD and ND become brighter.
(n)
Remove the black tape from the local light sensor on all six IDUs.
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A 747-400 MAINTENANCE MANUAL
(6) S 414-025Install the glare shield into the pilot instrument console (AMM 25-13-01/401).
(7) S 864-028Remove electrical power from the airplane if it is not necessary (AMM 24-22-00/201).
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747-400 MAINTENANCE MANUAL
EFIS BRIGHTNESS CONTROL - REMOVAL/INSTALLATION
______________________________________________
1. General_______
A. This subject has two tasks. The first task is to remove the EFIS brightness control. The second task is to install the EFIS brightness control. The installation task includes a test of the installation of the brightness control.
B. There are two pair of EFIS brightness control knobs (Fig. 401). One pair is on the left (captain's) side of the P72 panel. The other pair is on the right (first officer's) side of the P72 panel. Each pair of knobs control the applicable primary flight display (PFD) and navigational display (ND) brightness. The PFD brightness control is a single knob. The ND brightness control has an outer and inner knob.
C. The wires of the brightness control connect to the wire harness on the glare shield. You must remove the glare shield to get the access to the wire harness. The control is held into the P72 lightshield panel by a nut below the panel lightplate.
TASK 31-61-09-024-038
2. EFIS Brightness Control Removal_______________________________
A. Standard Tools and Equipment
(1) Tool- Soldering
B. References
(1) AMM 25-13-01/401, Pilots' Glare shield Assembly
C. Access
(1) Location Zone
221 Control Cabin, LH
222 Control Cabin, RH
D. Procedure
S 864-029
(1) Open these circuit breakers and attach DO-NOT-CLOSE tags:
(a) P7, Overhead Circuit Breaker Panel
1) 7F12, ND L
2) 7F13, PFD L
3) 7F17, ND R
4) 7F18, PFD R
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747-400
MAINTENANCE MANUAL
OUTBD-CRT-INBD
INBD-CRT-OUTBD
CAPT EFIS BRIGHTNESS CONTROLS F/O EFIS BRIGHTNESS CONTROLS
EFIS Brightness Control Location
Figure 401
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747-400
MAINTENANCE MANUAL
(b) P6, Main Power Distribution Panel
1) 6E19, CAPT PANEL FLT DK LIGHTS
2) 6E23, F/O PANEL FLT DK LIGHTS
S 024-030
(2) Remove the EFIS brightness control:
(a)
Remove all the knobs from the lightsheild panel (P72).
(b)
Remove the mounting screws from the lightplate.
(c)
Remove the lightplate.
(d)
Remove the nut and washer from the EFIS brightness control you will replace.
(e)
Remove the EFIS brightness control from the panel to gain access to the wires.
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