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• Maximum and Minimum Limitations: Red Arc
• Takeoff and Caution Range: Amber Arc
• Normal Operating Range: White Arc
2. Engine Pressure Ratio (EPR):
• No limitation markings
• 0.85 to 2.0: Pilot Selectable Command Marker
3. TGT °C:
• 800°C and above: Red Arc
• 715°C to 800°C: Amber Arc
• 0°C to 715°C: White Arc
4. % LP RPM (LP):
• 95.5% to 110%: Red Arc
• 0% to 95.5%: White Arc
5. % HP RPM (HP):
• 99.7% to 110%: Red Arc
• 97.5% to 99.7%: Amber Arc
• 46.6% to 97.5%: White Arc
• 0% to 46.6%: Red Arc
6. Fuel Flow (FF): No limitation markings.
7. Oil Temperature (OIL TEMP):
• 120°C and above: Red Digits
• 105°C to 120°C: Amber Digits
• -30°C to 105°C: White Digits
• -40°C to -30°C: Amber Digits
• Less than -40°C: Red Digits
8. Oil Pressure (OIL PRESS):
• 30 psi and above: White Digits
• 16 to 30 psi: Amber Digits
• 0 to 16 psi: Red Digits
9. Engine Anti-Ice Pressure:
• 60 psi: Red light on overhead panel
• See Section 01-30-20: Cowl Anti-Icing.
OPERATING MANUAL
EXPANDED LIMITATIONS 01-45-00
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10. Engine Fuel Temperature (ENG FUEL TEMP):
• 120°C and above: Red Digits
• 90°C to 120°C: Amber Digits
• -40°C to 90°C: White Digits
• Less than -40°C: Red Digits
01-45-30: Fuel EICAS Indications
1. Fuel Tank Temperature (FUEL TANK TEMP):
• 54°C and above: Red Digits
• -40°C to +54°C: White Digits
• Less than -40°C: Red Digits
01-45-40: APU EICAS Indications
1. EGT:
• 732°C to 1000°C: Red Arc
• 680°C to 732°C: Amber Arc
• 0°C to 680°C: White Arc
2. RPM:
• 110% to 120%: Red Arc
• 104% to 110%: Amber Arc
• 0% to 104%: White Arc
OPERATING MANUAL
01-45-00 EXPANDED LIMITATIONS
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AUXILIARY POWER UNIT (APU)
01-49-10: APU Operating Limits
1. General:
The APU can be operated on the ground, during takeoff, in flight and during
landing. In flight it is an optional source of electrical power via the AUX PWR
switch instead of one or both engine-driven alternators. The APU cannot be used
to supply pressurization airflow in flight.
2. Maximum Permissible EGT:
• Up to 60% RPM during start: 988°C
• 60% RPM to 100% during start: 821°C to 732°C (linear decrease)
• Running: 732°C
3. Maximum Rotor Speed:
The maximum rotor speed for all conditions is 110%.
01-49-20: APU Starting Limits
1. When Powered By Airplane Batteries:
Continuous operation of the APU starter when powered by airplane batteries is
limited to thirty (30) seconds per start with a maximum of three (3) consecutive
start attempts. Before attempting another start, allow twenty (20) minutes for
starter cool-down. Three (3) additional start attempts may be made, after which a
one (1) hour cool down period must be observed before the next full starter cycle
is commenced.
2. When Powered By An External DC Power Source:
Continuous operation of the APU starter when powered by an external DC power
source is limited to fifteen (15) seconds per start with a maximum of two (2)
consecutive start attempts. Before attempting another start, allow twenty (20)
minutes for starter cool-down. Two (2) additional start attempts may be made and,
OPERATING MANUAL
EXPANDED LIMITATIONS 01-49-00
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if unsuccessful, a one (1) hour cool down period must be observed before the next
full starter cycle is commenced.
NOTE:
An inspection is required within ten (10) APU operating
hours if the APU is operated above 30,000 ft for more
than one (1) hour during flight, or if the APU is
operated above 30,000 ft more than five (5) times.
Refer to the APU Maintenance Manual for specific
inspection requirements.
NOTE:
Successful consecutive starts are limited to six (6) at
ten (10) minute intervals per start.
NOTE:
See APU OPERATING ENVELOPE (For SN 1000 thru
SN 1155 without APU LOADMETER), Section 05-04-
20, APU Inflight Operation: Alternate Electrical Source
or ELWSAPU OPERATING ENVELOPE (For SN 1156
and subs, and SN 1000 thru SN 1155 with APU
LOADMETER INSTALLED), Section 05-04-30, APU
Inflight Operation: Alternate Electrical Source - ELWS
(Loadmeter) / ASC 420 Procedures.
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湾流4操作手册 Gulfstream IV Operating Manual 1(19)
