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• Ventilate the interior of the nacelle
• Provide access to engine components for inspection or servicing
• Collect fluids and deliver them overboard
• Collect core and fan air exhaust gases and propel them rearward
• Assist aircraft speed reduction on the ground
• Provide fire detection and protection within the nacelle
Each nacelle incorporates the following subsystems, units and components:
• Nose Cowl Structure
• Upper and Lower Hinged Cowl Doors
• Fixed Cowl Structure
• Aft Cowl Structure
• Engine Fire Protection System
The nacelle assemblies are dedicated to the left-hand (LH) or right-hand (RH)
engine installations and are not interchangeable. The principal material of
construction in the fixed and hinged cowling is honeycomb light alloy, except for a
steel section of panel assembly outer skin adjacent to the pylon. The nose cowl
structure is basically aluminum alloy, with an aft steel bulkhead forming engine
forward of the fireshield. The thrust reverser doors and aft cap (aft portion of
fairing) are steel construction with the rest of the thrust reverser fairing being of
aluminum alloy.
2. Description of Subsystems, Units and Components:
A. Nose Cowl Structure:
(See Figure 3.)
The nose cowl assembly is mounted to the engine air intake casing and
forms an annular duct where air is admitted to engine compressors. The
structure consists of an inner and outer skin supported by frames. The
nose cowl has a piccolo tube mounted inside where hot air is admitted
through a series of holes directly from a tap off the engine bleed air
manifold for anti-icing purposes. This air is exhausted through holes on the
inside of the cowl leading edge to engine air intake. An air inlet scoop is
located on the underside of the inlet cowl for alternator cooling purposes.
See Section 2A-30-30, Cowl Anti-Ice System, for nose cowl anti-icing.
B. Upper and Lower Hinged Cowl Doors:
(See Figure 4.)
(1) General:
The hinged cowlings consist of upper and lower main access doors,
hinged at the upper and lower edges of the fixed cowl respectively.
When closed, the doors are secured together with tension latches at
the outboard horizontal centerline of the nacelle. Adjustable jury
strut rods stowed inside the doors are used to secure the doors in
OPERATING MANUAL
2A-71-00 PRODUCTION AIRCRAFT SYSTEMS
Page 4
May 31/01
Revision 4
the open position for engine accessibility.
(a) Opening of upper and lower cowl doors:
NOTE:
Do not attempt to open the engine cowling if wind
speed is 60 mph or greater. Use extreme care when
opening the cowling above 30 mph.
Due to the mechanical arrangement of the upper and
lower cowl doors, the lower cowl door is to be opened
first. There are five tension latches securing the lower
door to the upper door and are numbered 1 (forward)
thru 5 (aft). In addition to these latches, there are also
two safety latches; which are both located at 6 o’clock
positions at the forward and aft ends of the lower door.
Any time cowl doors are open, ensure doors are
secured with front and rear hold open struts. This will
allow for utilization of the lower door as a maintenance
platform as well as prevent damage to the door and/or
fuselage due to high winds or jet blast.
If opening the lower cowl door outside of the hangar
and upper cowl door is not to be opened, use a
suitable tying device with at least 650 lb tensile
strength (no bungee or other stretchable cord) to
secure upper door in the closed position. High winds
can cause damage to upper door and surrounding
structures if it is not properly secured in this manner.
• Ensure area immediately surrounding the upper and
lower cowl doors is clear to allow opening of upper and
lower cowl doors.
• Position a maintenance platform (adjustable preferred)
adjacent to cowl doors. Allow enough vertical and
horizontal spacing to prevent the door from contacting
the platform.
• Using a flat blade screwdriver or another suitable
device, unlatch forward and aft safety latches.
• Depress button on each tension latch and pull firmly to
unlock the latches. Do so in the following sequence:
No. 1, 2, 4 and 5.
• Lift each of these four latches and secure the safety
hooks in theirlocking clips.
• Supporting the weight of lower cowl door, unlatch the
remaining No. 3 tension latch and secure its safety
hook in holding clip.
• Carefully lower cowl door to the open position.
• Insert the forward and aft jury struts and lock them to
　
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