CSP-HMI-3MD Helicopters, Inc.
MAINTENANCE MANUAL
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95-10-20
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Copyright © 1999−2016 by MD Helicopters, Inc.
ATTITUDE GYRO INDICATORS (RCA26BK−1/510−1A12)
INITIAL INSTALLATION
1. Attitude Gyro Indicator Initial Installation
Procedures in this section may be performed at
operator's discretion, and provide complete
instructions for initial installation of the
RCA26BK-1 and 510-1A12 Attitude Gyro
Indicators.
A. Attitude Gyro Indicator Operating,
Handling and Shipping Guidelines
Before involvement with an at
titude gyro indicator, whether
loose, installed in the helicopter, or even
sealed in its shipping container, become fa
miliar with gyro cautions (Ref. Attitude
Gyro Indicator Operating, Handling and
Shipping Guidelines).
B. Attitude Gyro Indicator Installation
(369H90038)
Consumable Materials
(Ref. Section 91−00−00)
Item Nomenclature
CM425 Sealing compound
CM704 Tie strap, nylon
CM706 Tie strap base
The attitude gyro indicator is supported in the
rear by a clamp fastened to a horizontal
support assembly. The support assembly is
mounted on two T-brackets riveted to the
instrument panel support structure. Some
helicopters already have both the T-brackets
and the support assembly installed (-501 and
-505 installations and ships with directional
gyro indicator installed). Some helicopters
require rework of the instrument panel in
order to add the T-brackets and the support
assembly (-503 and -507 installations).
Perform only the appropriate steps for your
helicopter.
(1). Preparation for Installation
:
(a). Identify all components, including
attaching hardware, or components
removed for access to work areas.
Protect components from damage
and foreign matter until installed.
(b). Check all cockpit electrical switches
for OFF condition.
NOTE: Ensure BATT-OFF-EXT switch is
OFF.
(2). Helicopter Equipment Removal Prior to
installation of the attitude gyro indica
tor, the following items must be
removed.
(a). Remove instrument panel hood and
left and right instrument panel side
fairings.
(b). Remove blank panel located where
directional gyro indicator is to be
installed on instrument panel. Retain
washers for reuse if indicator is to be
installed in a Slim-Line panel.
(3). Instrument Panel Modifications
(Slim-Line Instrument Panel):
NOTE: Removing one or both center
windshield panels will simplify this rework.
(a). Install T-brackets and support
assembly as follows (Ref.
Figure 901):
1). Locate existing stiffener and drill
out attaching rivets as required to
accommodate installation of
T-brackets.
2). Position T-brackets and support
assembly in place (support with
clamps) and drill brackets for new
rivets (pick up existing rivet holes
drilled out in previous step).
3). Rivet T-brackets to instrument
panel support structure.
4). With support assembly clamped to
T-brackets, drill support assembly
for fasteners (pick up existing holes
in T-brackets).
5). Install support assembly to T-
brackets, using screws, nuts and
washers.
CAUTION
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