34-MAINT MSG INDEX
SIL ALL
Page 119 D633A103-SIL Feb 15/2010 EFFECTIVITY

LRU/SYSTEM  MAINTENANCE MESSAGE  GO TO FIM TASK 
WEATHER RADAR  COOLING FAULT  34-43
TASK
805
 
WEATHER RADAR  NO AIR DATA IN  34-43
TASK
806
 
WEATHER RADAR  NO ATTITUDE IN  34-43
TASK
806
 
WEATHER RADAR  NO HEADING INPUT  34-43
TASK
806
 
WEATHER RADAR  NO RAD ALT  34-43
TASK
807
 
WEATHER RADAR  R/T FAULT  34-43
TASK
802
 
WEATHER RADAR  tilt code +1  34-43
TASK
806
 
WEATHER RADAR  tilt code +2  34-43
TASK
807
 
WEATHER RADAR  tilt code +3  34-43
TASK
806
 
WEATHER RADAR  tilt code +4  34-43
TASK
816
 
WEATHER RADAR  tilt code -1  34-43
TASK
806
 
WEATHER RADAR  tilt code -2  34-43
TASK
807
 
WEATHER RADAR  tilt code -3  34-43
TASK
806
 
WEATHER RADAR  tilt code -4  34-43
TASK
816
 
WEATHER RADAR  tilt code -5  34-43
TASK
817
 
WEATHER RADAR  tilt code -6  34-43
TASK
818
 
WEATHER RADAR  tilt code -7  34-43
TASK
819
 
WEATHER RADAR  tilt code -8  34-43
TASK
821
 

34-MAINT MSG INDEX
SIL ALL
Page 120 D633A103-SIL Feb 15/2010

801. Mach Airspeed Warning System -Fault Isolation
A. Description
(1) The Mach Airspeed Warning System failed to sound when the Test switch is pressed.
B. Possible Causes
(1)
Aural Warning Unit Module, M315.

(2)
Mach Airspeed Warning Module, P5-19.

(3)
Air Data Inertial Reference Unit, M1749 (Left) or M1752 (Right).

(4)
ADIRU Pilot Pressure Air Data Module, M1750 (Left) or M1753 (Right).

(5)
Wiring.

C. Circuit Breakers
(1) These are the primary circuit breakers related to the fault:
CAPT Electrical System Panel, P18-2
Row Col Number Name
E 3 C00170 MACH WARN SYS-1

F/O Electrical System Panel, P6-1
Row Col Number Name
B 7 C00549 MACH WARN SYS-2

D. Related Data
(1)
(SSM 34-16-11).

(2)
(SSM 34-16-21).

(3)
(WDM 34-16-11).

(4)
(WDM 34-16-21).

E. Initial Evaluation
(1)
Make sure that no impact pressure (<1.45mb) is applied to the applicable pitot probe.

(2)
Do
this
task:
Takeoff
Warning
(TOW)
BITE
Test,
31-51
TASK
801.

(3)
On the P5 panel push the applicable MACH AIRSPEED WARNING TEST switch.

(4)
If the Mach airspeed warning does not sound, then do the Fault Isolation Procedure below.

(5)
If the Mach airspeed warning does sound, then there was an intermittent fault.

F. Fault Isolation Procedure
(1) Replace the Flight Recorder/Mach Airspeed Warning Module. These are the tasks: Flight Recorder/Mach Airspeed Warning Test Module Removal, AMM
TASK 31-31-12-000-801,
Flight Recorder/Mach Airspeed Warning Test Module Installation, AMM
TASK 31-31-12-400-801.
　
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