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Figure 10
OPERATING MANUAL
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Cargo Door Control Panel
Figure 11
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Cargo Door Warning Lights on Instrument Panels
Figure 12
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POWERPLANT
2A-71-10: General Arrangement
1. General Description:
(See Figure 1.)
The Gulfstream IV is powered by two Rolls-Royce Tay Mk611-8 engines, each of
which is a twin-spool, axial-flow turbofan. The Tay is a high bypass ratio turbofan,
designed to achieve optimum fuel efficiency and component reliability, while
complying with noise requirements per FAR Part 36 Stage 3, which reflects the
same requirements of ICAO Annex 16 Chapter 3.
The Low Pressure (LP) spool consists of a single stage fan and a three stage
Intermediate Pressure (IP) compressor driven by a three stage LP turbine. The
High Pressure (HP) spool consists of a twelve stage HP compressor driven by a
two stage HP turbine.
The combustion section has ten liners that connect together in an annular
chamber. In each liner is a fuel spray nozzle that injects a fine spray of fuel into
the liner for ignition.
The fan bypass air stream and LP turbine exhaust are mixed in a twelve lobed
forced mixer before discharge to atmosphere through a common propelling
nozzle.
The engine is started by an air starter motor which rotates the HP compressor
shaft.
A. Engine Data:
(1) Ratings (Takeoff At ISA Sea Level, Static):
• Takeoff Thrust — 13,850 lbs.
• Pressure Ratio — 16.0:1
• Bypass Ratio — 3.10:1
(2) Compressors:
• LP compressor — 1 stage (fan)
• IP — 3 stages
• HP — 12 stages with variable inlet guide vanes and a bleed
valve
(3) Dimensions:
• Length — 94.7 inches
• Fan Tip Diameter — 44.0 inches
• Basic Weight (Dry) — 3255 lb
(4) 100% Shaft Speeds:
• LP — 8393 RPM
• HP — 12,484 RPM
B. Subsections Within This Section:
This section is divided into the following subsections:
• 2A-71-20: Nacelle Arrangement
• 2A-71-30: Mechanical Accessories
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PRODUCTION AIRCRAFT SYSTEMS 2A-71-00
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2. Limitations:
A. Primary Parameter Operating Limits:
The following limitations exist for the Tay Mk611-8 engines installed on the
Gulfstream IV:
Condition LP % RPM
HP %
RPM
TGT C° Time Limit
Maximum Ground Starting
TGT — — 700 Momentary
Maximum Relighting
(Airstart) TGT — — 780 Momentary
Maximum Takeoff 95.5 99.7 716 -
800 5 Minutes (1)
Maximum Go-Around 95.5 99.7 716 -
800 5 Minutes (1)
Maximum Continuous (2) 95.5 97.5 715 Unrestricted
Minimum Idle Approach — 67.0 — Unrestricted
Minimum Ground Idle — 46.6 — Unrestricted
Maximum Reverse — 88.0 695 (3)
Maximum Overspeed 98.3 102.6 — 20 Seconds
Maximum
Overtemperature — — 801 -
820 20 Seconds
NOTE(S):
(1) The use of takeoff thrust on Go-Around rating is limited to five (5)
minutes all engines operating or ten (10) minutes in the event of an engine
failure.
(2) Maximum continuous power is not recommended for normal flight
operations. Continued use of this power setting may result in reduced
engine life.
(3) For airplanes SN 1000 thru 1143 without ASC 166: use of thrust
reversers is limited to one (1) minute every thirty (30) minutes.
B. Takeoff Power:
For minimum acceptable power settings for takeoff, refer to RATED EPR
SETTINGS FOR TAKEOFF THRUST charts in Section 5 of the Airplane
Flight Manual. Takeoff EPR must not exceed rated value by more than
0.01.
C. Tailwind Takeoff:
Maximum tailwind component approved for takeoff and landing is 10 knots.
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2A-71-00 PRODUCTION AIRCRAFT SYSTEMS
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Powerplant General Arrangement
Figure 1
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2A-71-20: Nacelle Arrangement
1. General Description:
(See Figure 2.)
The nacelle is designed to:
• House the engine in an aerodynamic casing
　
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