CSP−900RMM−2MD Helicopters, Inc.
Rotorcraft Maintenance Manual
Page 201
Revision 4
26-10-20
DECK AND ENGINE AREA FIRE/OVERHEAT DETECTION SYSTEM
MAINTENANCE PRACTICES
1. Deck and Engine Area Fire/Overheat
Detection System Inspection/Test
(Ref. Figure 201, Figure 202, and Figure 203)
A. Deck and Engine Fire/Overheat Detection
Inspection
(1). Remove engine cowl assembly L260 or
R260 (Ref. Section 06-00-00).
(2). Inspect fire detection control units for
security.
(3). Inspect fire detection cable connectors
for security.
(4). Inspect sensor portion of cable for
chafing. 0.006 in (0.152 mm) maximum
depth allowed.
(5). Inspect fire detection cable for breaks.
Replace cable assembly if broken.
(6). Inspect quick release clamps for
security, quick release mechanism for
latching and locking. Repair or replace
as required.
(7). Inspect for damaged or broken Z
brackets. Repair or replace as required.
(8). Inspect detection cable for missing,
deteriorated, and secure rubber
grommets. Repair of replace as re
quired.
(9). Install engine cowling assembly L260
or R260 (Ref. Section 06-00-00).
B. Deck and Engine Fire/Overheat Detection
Cable Test
Special Tools
(Ref. CSP−SPM)
Item Nomenclature
T1002 Milli−Ohm Meter
T1012 Megohmmeter, Digital/Analog
(1). Detach connectors at both ends of cable.
(2). Verify the cable contact pin is centered
in the connector. No physical damage
allowed.
(3). Inspect for corrosion or foreign objects.
None allowed.
(4). Using milli-ohm meter (T1002)
measure the resistance from the center
pin on one end to the center pin on the
other end.
Maximum resistance 4.25 ohm for
engine detection cable.
Maximum resistance 8.05 ohm for
transmission detection cable.
(5). Using megohmmeter (T1012) measure
the resistance from the center pin to
the outer sheath (center pin negative).
Use 100 Vdc test voltage.
Test at ambient temperature of 70° F
(21.1° C) to 80° F (26.7° C).
Minimum resistance 1.7 Mohm.
(6). Replace faulty cable.
(7). Attach connectors at both ends of cable
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