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APU alternator can deliver 100% electrical power (30 kVA) on
ground or in ßight from Sea Level to 30,000 ft. From 30,000 ft
to 35,000 ft, the limit load decreases to 67% electrical power
(20 kVA). Load shedding may be required. See ELWS APU
ALTERNATOR ELECTRICAL LOAD (SN 1156 and
Subsequent, SN 1000 Through 1155 With APU Loadmeter
Installed or Removed By ASC 420, and SN 1430 and Subs),
Figure 6.
B. System Notes:
If the APU is started with the right lower engine cowling open, the high
temperature APU exhaust will cause signiÞcant damage to the engine
cowling. A visual inspection of the area surrounding the right engine should
be accomplished prior to starting the APU. On airplanes SN 1455 and
subsequent, an amber COWL OPEN annunciator is installed on the APU
control panel. With the annunciator illuminated, APU starting is inhibited
until the right lower engine cowling is closed. On airplanes SN 1000
through 1454, this feature was available for installation as an option during
outÞtting.
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APU Control Panel
Figure 2
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APU Load and ELWS Warning Indications
Figure 3
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APU ALTERNATOR ELECTRICAL LOAD (SN 1000 Ð 1155 Without APU Loadmeter)
Figure 4
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APU Operating Envelope (SN 1000 Ð 1155 Without APU Loadmeter)
Figure 5
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ELWS APU Alternator Electrical Load (SN 1156 & Subs, SN 1000 Ð 1155 With APU
Loadmeter Installed or Removed By ASC 420, SN 1430 & Subs)
Figure 6
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ELWS APU Alternator Operating Envelope (SN 1156 & Subs, SN 1000 Ð 1155 With
APU Loadmeter Installed or Removed By ASC 420, SN 1430 & Subs)
Figure 7
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DOORS
2A-52-10: General
1. Fuselage Doors:
The Gulfstream IV is Þtted with doors for access to the pressurized and
unpressurized sections of the fuselage. Doors installed in the pressurized section
are equipped with seals that maintain airplane pressurization integrity. For the
doors in the unpressurized section, no seals are required and use of these doors
is restricted to ground operations.
A. Pressurized Section Doors:
The following doors and openings are Þtted into the pressurized section of
the airplane fuselage:
• Main entrance door
• Baggage compartment door
• Cargo door (optional installation)
• Emergency exit windows
B. Unpressurized Section Doors:
The following doors and openings are Þtted into the unpressurized section
of the airplane:
• Tail compartment door
• Service access doors
2. Door Controls and Indications:
The main entrance door and the optional cargo door are hydraulically powered
through switch selections on the respective control panels. Each control panel has
appropriate indicators for operating the door. The remaining doors in the
pressurized and unpressurized areas of the fuselage are manually operated.
All doors are monitored by door warning circuits that provide indications to the
cockpit if the doors are not closed and locked or latched.
2A-52-20: Fuselage Doors
1. Pressurized Section Doors:
The pressurized section of the fuselage is equipped with a main entrance door, a
baggage compartment door, overwing emergency exits, and at customer option, a
cargo door Þtted into the fuselage forward of the right wing leading edge. See
Figure 1 and Figure 2. All doors that are used in normal operations are equipped
with inßatable seals around the circumference of the doors. The seals are inßated
by pneumatic pressure from the airplane bleed air manifold to seal the opening
around the doors to preserve cabin pressurization integrity. The overwing
emergency exits are plug type openings with Þxed non-inßatable seals designed
　
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