MD Helicopters 369-500, Maintenance Instructions Manual

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.
MAINTENANCE MANUAL
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12. Digital TOT Indicating System Inspection
(369D/E − 500N)
(Ref. Figure 503)
Special Tools
(Ref. Section 91 − 00 − 00)
Item Nomenclature
N/A Fluke, Model No. 714 tester
N/A Omega, Model No. CL − 307A − K tester
N/A Barfield, Model No. TT − 1000A tester
(1). Disconnect the engine thermocouple
wire harness at the TC300 terminal
block located over the left-hand engine
compartment door.
(2). Connect tester to TC300.
(a). Connect tester wire to #8 stud on
TC300 (white chromel wire)
(yellow lead for Fluke and Omega,
red for Barfield).
(b). Connect tester wire to #10 stud on
TC300 (green alumel wire)
(red lead for Fluke and Omega, black
for Barfield).
For Omega and Fluke testers,
do not force lead into tester, one
lead prong of plug is larger than the other,
damage to tester connection will occur.
(c). Connect lead to tester.
(3). Set power switch to source for Omega
and Fluke or ON position for Barfield.
(4). Set indicator to temperatures in
Table 505.
(5). Turn on aircraft electrical power.
NOTE:
TOT indicator requires approximately
five seconds to reset internal circuitry.
(6). Verify TOT gauge indicates same as
tester, within tolerance (Ref.
Table 505).
(a). If TOT indicator matches tempera­
tures in Table 505, no further action
is required.
(b). If TOT indicator does not match
temperatures in Table 505, refer to
applicable Rolls Royce Allison
Operation and Maintenance Manual
for possible maintenance actions.
(7). Turn off aircraft electrical power.
(8). Set source switch to off position.
(9). Disconnect tester from TC300.
(10). Reconnect engine thermocouple wire
harness to TC300 terminal block.
(11). Record compliance to the Service
Bulletin in the Compliance Record
section of the helicopter Log Book.
Table 505. TOT System Test (369D/E −
500N)
Tester Setting ( ° C) Indicator Reading ( ° C)
700
°
700
° ±
10
°
725
°
725
° ±
10
°
752
°
752
° ±
10
°
810
°
810
° ±
10
°
CAUTION