MD Helicopters MD Explorer - Maintenance Practices; Overheat Bleed Air Leak Detection System Cable Test; Overheat Bleed Air Leak Detection System Inspection; Overheat Bleed Air Leak Detection System Inspection;Test

CSP−900RMM−2MD Helicopters, Inc.
Rotorcraft Maintenance Manual
Page 201
Revision 4
26-10-10
OVERHEAT BLEED AIR LEAK DETECTION
(HEAT/DEFOG) SYSTEM
MAINTENANCE PRACTICES
1. Overheat Bleed Air Leak Detection
System Inspection/Test
A. Overheat Bleed Air Leak Detection
System Inspection
(Ref. Figure 201)
(1). Remove soft insulation panel on aft
right side of FS 230.5 bulkhead (Ref.
25-50-00).
(2). Remove cockpit floor access panels
AR129 and AR138 (Ref. Section
06-00-00).
(3). Remove cabin floor panel AR165 (Ref.
Section 06-00-00).
(4). Remove right baggage compartment
outboard floor panel AR250 (Ref.
Section 06-00-00).
(5). Inspect detection cable for broken wire.
Replace cable assembly if broken.
(6). Inspect sensor portion of cable for
chafing. 0.006 in (0.152 mm) maximum
depth allowed.
(7). Inspect cable tie straps securing cable
to bleed air line and to inside and
outside shields. Replace broken ties.
(8). Inspect rubber grommet securing
detection cable for deterioration.
Replace grommets as required.
(9). Inspect control unit for security of
attachment hardware. Electrical
connector for corrosion and security.
(10). Inspect connector couplings for safety
wire and security.
(11). Install right baggage compartment
outboard floor panel AR250 (Ref.
Section 06-00-00).
(12). Install soft insulation interior trim
panel on aft right side of FS 230.5
bulkhead (Ref. Section 25-50-00).
(13). Install cabin floor panel AR165 (Ref.
Section 06-00-00).
(14). Install cockpit floor access panel AR138
and AR129 (Ref. Section 06-00-00).
B. Overheat Bleed Air Leak Detection
System 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 8.05
ohm.
(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