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OPERATING MANUAL
PRODUCTION AIRCRAFT SYSTEMS 2A-71-00
Page 5
May 31/01
Revision 4
the full open position.
• Raise maintenance platform to the approximate
vicinity to bottom of the upper cowl door.
• Raise the upper door, insert the forward and aft jury
struts and lock them to the full open position.
(b) Closing of upper and lower cowl doors:
NOTE:
If upper cowl door was not opened and is secured to
the closed position, remove the securing device at this
time.
• Inspect the area inside and outside of the cowl doors
to ensure area is clear of tools, maintenance
equipment and other objects.
• Manually support upper cowl door. Release and stow
front and rear jury struts.
• Lower upper cowl door to the closed position.
• Lower adjustable platform to a suitable height to allow
access and clearance of lower cowl door.
• Manually support lower cowl door. Release and stow
front and rear jury struts.
• Raise and support lower cowl door in the closed
position and push button on each tension latch to
disengage safety hooks in the locking clips.
• Engage and lock lower cowl door to upper cowl door
with the No. 3 tension lock by applying firm overcenter
pressure.
• Engage and lock the remaining four tension latches in
the following order: No. 4, 5, 2 and 1 in a similar
manner.
• Verify each of the five latches (and button within that
latch) is flush and locked.
• Latch forward and aft safety latches at under side of
lower cowl.
• Remove maintenance platform from adjacent area.
(2) Access Doors:
Three access doors are located in lower main door:
• One for engine oil sight gage and oil refill
• One for starter manual shutoff valve
• One for fire access (push to open)
Exhaust ports on lower door include an alternate cooling outlet, a
nacelle vent and an LP exhaust air outlet.
OPERATING MANUAL
2A-71-00 PRODUCTION AIRCRAFT SYSTEMS
Page 6
May 31/01
Revision 4
C. Fixed Cowl Structure:
(See Figure 5.)
The fixed cowl is attached to the nose cowl and thrust reverser housing. It
provides for attachment of upper and lower hinged cowlings. Openings and
fluid fittings are also provided for services to and from power plant (such as
bleed air duct openings, hydraulic fluid and fuel fittings, etc.).
The engine fire extinguishing distribution nozzles and two of the three
engine fire detection elements are fitted at lower portion of fixed cowl.
An access panel is located in the upper forward portion of right hand fixed
cowl for anti-ice manual override access.
D. Aft Cowl Structure:
(See Figure 6.)
The aft cowl structure includes the exhaust nozzle and thrust reverser
actuator and linkage. It consists of a forward fairing (fixed), an outboard
stang beam fairing, an inboard scoop fairing and upper and lower thrust
reverser doors.
E. Engine Fire Protection System:
See Section 2A-26-00, Fire Protection, for details on engine fire protection
components.
3. Limitations:
A. Flight Manual Limitations:
There are no Flight Manual limitations established for the nacelle at the
time of this revision.
B. Other Limitations:
(1) Lower Cowl Door Weight Limit:
The lower cowl door is designed to support the weight of up to two
persons of average weight and a small tool box.
(2) Maximum Wind Velocity With Cowl Doors Open:
Open cowl doors are designed to withstand wind speeds of up to
sixty (60) knots when properly secured with front and rear jury struts
in the extended and locked position.
OPERATING MANUAL
PRODUCTION AIRCRAFT SYSTEMS 2A-71-00
Page 7
May 31/01
Revision 4
Nacelle Components
Figure 2
OPERATING MANUAL
2A-71-00 PRODUCTION AIRCRAFT SYSTEMS
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May 31/01
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Nose Cowl Structure
Figure 3
OPERATING MANUAL
PRODUCTION AIRCRAFT SYSTEMS 2A-71-00
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May 31/01
Revision 4
Upper and Lower Hinged Cowl Doors
Figure 4
OPERATING MANUAL
2A-71-00 PRODUCTION AIRCRAFT SYSTEMS
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May 31/01
Revision 4
Fixed Cowl Structure
Figure 5
OPERATING MANUAL
PRODUCTION AIRCRAFT SYSTEMS 2A-71-00
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May 31/01
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Aft Cowl Structure
Figure 6
OPERATING MANUAL
2A-71-00 PRODUCTION AIRCRAFT SYSTEMS
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May 31/01
Revision 4
2A-71-30: Mechanical Accessories
1. General Description:
The purpose of the Mechanical Accessories system is to provide services for the
　
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