MD Helicopters 369-500, Maintenance Instructions Manual

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CSP-HMI-3
MD Helicopters, Inc
.
MAINTENANCE MANUAL
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[ Chapter 95 TOC ]
95-30-00
Page 401
Revision 13
The information disclosed herein is proprietary to MD Helicopters, Inc.
Neither this document nor any part hereof may be reproduced or transferred to
other documents or used or disclosed to others for manufacturing or any other
purpose except as specifically authorized in writing by MD Helicopters, Inc.
Copyright
©
1999 − 2016 by MD Helicopters, Inc.
POWER TRAIN INSTRUMENTS
REMOVAL/INSTALLATION
1. Chip Detector Circuits Replacement
(Ref. Sec. 12-00-00, Main Rotor Transmission
Draining, Tail Rotor Transmission Draining
and Engine Oil System Draining for removal
and installation instructions.)
2. Tachometer Indicating Systems
Maintenance Procedures
(Ref. Sec. 95-00-00, Instrument Replacement,
Instrument Inspection, and Instrument
Repair)
NOTE:
(Effectivity: 369D/E/FF - 500N)
D
Dual tach indicators stored in excess of 12
months must be returned to an approved
repair station for functional test prior to
being installed in a helicopter.
D
Dual tach indicators stored in excess of 24
months must be returned to an approved
repair station for re-lubrication and func­
tional testing prior to installation in a he­
licopter.
D
If it cannot be determined how long an af­
fected dual tach indicator has been in
storage, the indicator must be returned to
an approved repair station for re-lubrica­
tion and functional testing prior to instal­
lation in a helicopter.
3. Tachometer Generator Replacement
Following instructions are typical and apply to
all three tachometer generators.
(1). For access to generators, open engine
access doors or air inlet and tail rotor
drive shaft access door, as applicable.
(2). Disconnect electrical connector from
generator. Cap and stow if replacement
is not imminent.
(3). Disconnect bonding jumper.
(4). Disconnect and remove tachometer
generator from mounting pad. Discard
gasket if unserviceable.
(5). Install and secure generator with
gasket, attaching hardware and
bonding jumper. Generator-to-mount­
ing pad electrical bond is required.
(6). Connect electrical connector to genera­
tor.
(7). Close access door(s).
4. TOT Indicator Maintenance Procedures
(Ref. Sec. 95-00-00, Instrument Replacement,
Instrument Inspection and Instrument Repair)
5. Thermocouple Wiring Harness
Maintenance Procedure
A one-piece thermocouple wiring harness
connects the engine thermocouple harness
from the engine terminal block (TC300) to
resistor board TB9 at the back of the TOT
indicator. Maintain the engine thermocouple
wiring harness according to instructions in the
applicable Allison Engine Operation and
Maintenance Manual (Ref. Sec. 01-00-00,
Table 201) and as follows:
Special Tools
(Ref. Section 91 − 00 − 00)
Item Nomenclature
ST1008 Crimping tool
(1). Replace early type silver solder termi­
nal lugs with current type (crimped)
terminals using crimping tool (ST1008).
To ensure proper calibration
and operation of the TOT sys­
tem, alumel and chromel terminals must be
correctly installed.
(2). After completion of any repair, adjust
TOT circuit resistance (Ref. TOT
Indicating System Calibration).
CAUTION