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2. Main AC and DC Busses powered by APU will be unpowered at time of failure due to
configuration of EPMP bus switches.
3. Power to failed buses may be regained by Selecting AUTO on EPMP panel for those buses.
4. Remaining Converter will be capable of powering airplane for remainder of flight.
5. If APU has flamed out, the pilot may elect to descend to 15,000 ft., restart APU, return to
cruise altitude, and monitor APU electrical load.
6. Allow time during descent for windshield heat to defog windows.
Alternator/Converter Failure
1. Essential AC and DC buses will automatically transfer to APU alternator and TRU.
2. Main AC and DC buses powered by Converter will be unpowered at time of failure due to
configuration of EPMP bus switches.
3. DO NOT attempt to repower failed buses by switching their power source to APU unless
airplane altitude is 30,000 ft. or less. APU Alternator is not capable of powering entire
airplane above 30,000 ft.
4. On descent for approach and landing, power to failed buses may be regained by Selecting
AUTO on EPMP panel for those buses. Accomplish this at or below 30,000 ft.
5. Allow time during descent for windshield heat to defog windows.
GULFSTREAM AEROSPACE
GIV AIRPLANE FLIGHT MANUAL
SECTION 3
ABNORMAL
PROCEDURES
FAA APPROVED 3-47
13 September 2000
APU OPERATING ENVELOPE IN-FLIGHT – ELWS/ASC 420 OPERATIVE
See ELWS APU OPERATING ENVELOPE figure for airplanes SN 1156 and subs. and
airplanes SN 1000 thru SN 1155 with APU Loadmeter installed or removed by ASC 420 and SN
1430 and subs.
Guaranteed Starting: Running:
Altitude 15,000 ft. and below Altitude 35,000 ft. and below
Airspeed 250 KCAS Maximum Airspeed VMO/MMO Maximum
GULFSTREAM AEROSPACE
GIV AIRPLANE FLIGHT MANUAL
SECTION 3
ABNORMAL
PROCEDURES
3-48 FAA APPROVED
31 May 2000
Figure 3-1: APU Operating Envelope
For SN 1000 thru 1155 without APU LOADMETER
GULFSTREAM AEROSPACE
GIV AIRPLANE FLIGHT MANUAL
SECTION 3
ABNORMAL
PROCEDURES
FAA APPROVED 3-49
31 May 2000
Figure 3-2: APU Alternator Electrical Load
For SN 1000 thru 1155 without APU LOADMETER
GULFSTREAM AEROSPACE
GIV AIRPLANE FLIGHT MANUAL
SECTION 3
ABNORMAL
PROCEDURES
3-50 FAA APPROVED
13 September 2000
Figure 3-3: ELWS/ASC 420 APU Operating Envelope
For SN 1156 and sub and SN 1000 thru 1155 with APU LOADMETER installed
or removed by ASC 420 and SN 1430 and sub
GULFSTREAM AEROSPACE
GIV AIRPLANE FLIGHT MANUAL
SECTION 3
ABNORMAL
PROCEDURES
FAA APPROVED 3-51
13 September 2000
Figure 3-4: ELWS/ASC 420 APU Alternator Electrical Load Envelope
For SN 1156 and sub and SN 1000 thru 1155 with APU LOADMETER installed
or removed by ASC 420 and SN 1430 and sub
GULFSTREAM AEROSPACE
GIV AIRPLANE FLIGHT MANUAL
SECTION 3
ABNORMAL
PROCEDURES
3-52 FAA APPROVED
11 October 2001
3-07-70: Bus Fault - AC or DC Reset Light On:
Electrical system Main and Essential buses are protected by an automatic bus protection system.
The bus protection system can be activated by a bus fault (over current), by a logic problem
within a Bus Power Control Unit (BPCU), or by a relay or component failure; and when
activated results in a lighted AC or DC RESET LIGHT.
A fault on any MAIN BUS will result in that bus being disconnected and isolated from all power
sources. (No power source switch light will be illuminated). A fault on the ESS AC BUS will
cause the AC BPCU to cycle bus power source from LEFT to RIGHT and then to the E INV: the
amber E INV "ON" switch light, and AC RESET light will both be illuminated.
A fault on the ESS DC BUS will result in the bus being switched from LEFT to RIGHT and then
to BATT: the amber BATT "ON" switch light, and DC RESET light will both be illuminated.
The general procedure to follow in response to a lighted AC or DC RESET light is to observe the
relevant AC or DC buses (Mains and Essentials) for indications of, or lack of, a power source to
those buses, and then press the illuminated AC (or DC) RESET light.
When RESET light is pushed, one of three events will occur:
1. RESET light will extinguish and remain out.
2. RESET light will extinguish, the relevant BPCU will cycle the bus through its possible
power sources, then the RESET light will re-illuminate.
3. RESET light will not extinguish but, instead, remains illuminated.
Specific procedures for Main AC or Main DC buses, for Essential AC bus, and for Essential DC
Bus, for each of these possibilities follow.
NOTE: The Master and RESET Switches should not be cycled more than once every ten (10)
　
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