(2)  
Fault codes are shown in alpha numeric format on the HUD control panel. The fault codes are grouped by LRU. The alpha part of the fault code is an abbreviation of the suspected LRU; HC is the HUD Computer, OHU is the Overhead Unit, DEU is the Drive Electronic Unit, and HCU is the HUD Control Unit.

(3)  
The HGS computer stores fault data that occur in flight. You can see faults that occurred on previous flight legs to help isolate an intermittent fault that is not found by the BITE self-test.

B.  BITE Procedure
(1)  Do the BITE procedure for the HUD.
(a)  Push and release the TEST switch on the HUD control panel.
NOTE: When you hold the TEST switch for more than 4 seconds, you test the control panel display. 1) Make sure these indications show: a) The FAULT light on the HUD control panel comes on during the BITE. b) TEST shows on the STBY display line on the HUD control panel. c) The FAULT light on the HUD control panel goes off after the BITE. d) The LED on the TEST switch comes on. e) The LED on the TEST switch goes off after the BITE. f) No maintenance message fault codes show on the STBY display line. 2) Refer to the following table to find the fault isolation task for the applicable maintenance message.
Table 201

HCP FAULT CODE  COMBINER DISPLAY  GO TO FIM TASK 
HC01  FC01  34-36
TASK
851
 
HC02  FC02  34-36
TASK
851
 
HCAC03  FC03  34-36
TASK
803
 
HC04  FC04  34-36
TASK
851
 
HC05  FC05  34-36
TASK
803
 

EFFECTIVITY SIL 004, 005, 017, 018  34-36 TASK 801 
D633A103-SIL BOEING PROPRIETARY -Copyright # Unpublished Work -See title page for details  Page 201 Jun 15/2010 

HCP FAULT CODE
COMBINER DISPLAY
GO TO FIM TASK

HC10 FC10
34-36
TASK
803
HC12
FC12

34-36
TASK
803
HC15
FC15

34-36
TASK
803
HC16
FC16

34-36
TASK
803
HC17
FC17

34-36
TASK
803
HC20
FC20

34-36
TASK
803
HC22
FC22

34-36
TASK
803
HC23
FC23

34-36
TASK
803
HC25
FC25

34-36
TASK
803
HC26
FC26

34-36
TASK
803
HC28
FC28

34-36
TASK
803
HC31
FC31

34-36
TASK
803
HC32
FC32

34-36
TASK
803
HC34
FC34

34-36
TASK
803
HC38
FC38

34-36
TASK
803
HC39
FC39

34-36
TASK
803
HC40
FC40

34-36
TASK
803
HC41
FC41

34-36
TASK
803
HC42
FC42

34-36
TASK
803
HC44
FC42

34-36
TASK
803
HC47
FC47

34-36
TASK
803
HC48
FC48

34-36
TASK
803
HC49
FC49

34-36
TASK
803
HC50
FC50

34-36
TASK
803
HC51
FC50

34-36
TASK
803
HC52
FC52

34-36
TASK
803
HC53
FC52

34-36
TASK
803
HC54
FC54

34-36
TASK
803
HC55
FC55

34-36
TASK
803
HC56
FC56

34-36
TASK
803
HC57
FC57

34-36
TASK
803
HC58
　
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