Revision - MD Helicopters MD Explorer Servicing And Maintenance

1. Introduction
The MD Explorer (Model MD900) is a light
twin engine helicopter, provided by MD
Helicopters, Inc. (MDHI). The rotorcraft is
certified by the Federal Aviation Administra­
tion under FAA Type Certificate Number
H19NM. The helicopter is designed to carry
seven people, in addition to the pilot, or it can
be fitted for internal payloads and/or for
jettisonable external payloads
2. Aircraft Configuration
The Model MD900 has two main production
configurations. The configurations are
designated as the 900 CONFIG and the 902
CONFIG These designations are used
throughout the publications applicable to the
MD900 to indicate where the two configura­
tions are different. Where the two configura­
tions are identical, no configuration is speci­
fied.
The Model MD900 helicopter is approved for
Pratt and Whitney engines; two (2) PW206A,
or two (2) PW206E, or two (2) PW207E.
The 900 CONFIG can have the following
engine models installed;
- PW206A engines,
- PW206E engines,
- PW207E engines.
The 902 CONFIG can have the following
engine models installed;
- PW206E engines,
- PW207E engines.
Each engine model requires a specific
Electronic Engine Control (EEC) and Inte­
grated Instrument Display System (IIDS).
To determine which IIDS and EEC are
necessary for each engine model, reference
CSP-900IPL-4, Section 76-00-00.
MD Helicopters, Inc.
Rotorcraft Maintenance Manual
INTRODUCTION
DESCRIPTION AND OPERATION
A. 900 CONFIG
The 900 CONFIG designates Model MD900
serial numbers 90000010 thru 90000051. The
900 CONFIG is the MD900 as originally type
certificated.
B. 902 CONFIG
The 902 CONFIG designation started at
MD900 serial number 90000052 and subse­
quent. The 902 CONFIG incorporates changes
to the original MD900 to meet the require­
ments of FAR Part 27 Appendix C Category A.
The major changes for the 902 CONFIG are
as follows:
Fuel System -The 902 CONFIG fuel system
incorporates a longitudinal baffle in the fuel
tank to provide separate left and right fuel
supplies. The crossfeed system is removed and
a fuel transfer system installed. Vapor
shrouding is added to fuel feed system above
the upper deck.
Fuel Quantity -The 902 CONFIG fuel
quantity has a separate low level light for the
left and right side of the fuel cell.
Powerplant - The 902 CONFIG uses the
Pratt & Whitney 206E or 207E engine.
Pedal Anticipator -The 902 CONFIG has a
pedal anticipator. This signals the EEC of an
impending load demand increase caused by an
increase of the anti-torque fan pitch.
NACA Inlet -(National Advisory Committee
for Aeronautics). The 902 CONFIG has an
additional engine air inlet forward of the
existing inlet designated the NACA Inlet. The
NACA inlet is of the submerged duct design as
developed by NACA.
Anti-Torque Fan Tip Seal -An improved
profile tip seal is installed on the 902 CON­
FIG.
01-00-00
CSP−900RMM−2
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Revision 26