CSP−900RMM−2MD Helicopters, Inc.
Rotorcraft Maintenance Manual
Page 101
Revision 4
26-10-10
OVERHEAT BLEED AIR LEAK DETECTION
(HEAT/DEFOG) SYSTEM
FAULT ISOLATION
1. Overheat Bleed Air Leak Detection
System Troubleshooting
(Ref. Figure 101)
The following troubleshooting procedures are a
brief summary of overheat bleed air leak
detection system faults which may be encoun
tered (Ref. Table 101).
Troubleshooting tables should be used with
system schematics, electrical wiring diagrams,
serviceability checks and other detailed
procedures in this and other chapters of the
manual.
Comprehensive wiring diagrams are available
in the Rotorcraft Maintenance Manual
CSP-900RMM-3.
Table 101. Overheat Bleed Air Leak Detection (Heat/Defog) System Troubleshooting
Fault Probable Cause Corrective Action Ref. Section
SENSFALT=12 Appears on
IIDS alpha/numerical display.
Faulty overheat bleed air
leak detection control box.
Remove and replace overheat
control unit.
26−10−00
Fault in overheat Bleed air
leak detection (See Notes).
Circuit breaker BLD AIR
LEAK CB 6 not set on
Electrical Load Center.
Set or reset circuit breaker. 96−00−00
Faulty circuit breaker. Replace circuit breaker. 96−00−00
Detector cable center
conductor high resistance.
Test detector cable. 26−10−00
Detector cable low insulation
resistance.
Test detector cable. 26−10−20
Faulty wiring between
overheat control unit and
IIDS.
Test and repair wiring. 98−00−00
NOTES:
(1) The overheat bleed air leak detection system is automatically self tested by the Integrated Instrument
Display System (IIDS) when electrical power is applied. Additionally if a manual test is required, a built in
fault detection circuit wired into a press to test DISP key located on the IIDS front panel may be used. By
depressing and holding the DISP key 3 to 5 seconds all liquid crystal display (LCD) illuminate. When the
DISP key is released a 1 second flash of the CAB HEAT WARNING indicates a normal functional
system. ACFTFALT=4 No flash of the CAB HEAT WARNING indicates a fault in the overheat bleed air
leak detection system.
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