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OH-58 Numbers and Limitations
Essential numerics for the Bell OH-58 Kiowa
66
Aviation
Professional
07/10/2013

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Cards

Term
Speed of the gas producer at 100% N1?
Definition
51000 RPM
Term
Speed of the power turbine at 100% N2?
Definition
33000 RPM
Term
Engine driven fuel pump runs at?
Definition
650-750 psi
Term
Engine oil tank capacity?
Definition
5.2 L
Term
Max engine oil temperature?
Definition
107˚C
Term
Max engine oil pressure?
Definition
130 psi
Term
Min engine oil pressure @ <78.5% N1?
Definition
50 psi
Term
Min engine oil pressure @ 78.5-94.2% N1?
Definition
90 psi
Term
Min engine oil pressure @ >94.2% N1?
Definition
115 psi
Term
How much TOT increase is expected when using anti-icing?
Definition
10-20˚C
Term
What is the fuel pressure normal range?
Definition
4-30 psi with a nominal reading of 14 psi
Term
Quantity read by the upper fuel probe?
Definition
50-74 US Gallons
Term
Quantity read by the lower fuel probe?
Definition
50 US Gallons or less
Term
Quantity of the fuel range extender?
Definition
20 US Gallons
Term
What is the limited pitch and bank when limited in fuel?
Definition
10˚ pitch and bank when 15 US Gallons or less
Term
What are the limits when only one fuel boost pump is running?
Definition
Limited to a 6000' pressure ceiling and 10 US Gallons is now unavailable
Term
What are the RPM in the accessory gear box for N2?
Definition
From 33000 to 6000 RPM
Term
What is the RPM reduction in the transmission?
Definition
From 6000 to 384 RPM at main rotor
Term
What is the RPM reduction in the tail rotor gearbox?
Definition
From 6000 to 2550 RPM
Term
What is the hydraulics pressure?
Definition
600 +/- 25 psi
Term
"BATT TEMP" illuminates at...
Definition
54.4˚C
Term
"BATT HOT" illuminates at...
Definition
60˚C
Term
Recommended GPU...
Definition
28 Volts 350-450 Amps and the allowable capacity is 28 Volts 300-750 Amps
Term
Inverter converts the 28 VDC into...
Definition
115 VAC 400 Hz
Term
"ROTOR LOW RPM" illuminates at...
Definition
90% +/- 3 %
Term
"TRANS OIL PRESS" illuminates at...
Definition
below 30 psi
Term
"TRANS OIL TEMP" illuminates at...
Definition
above 110˚C
Term
"FUEL PUMP" illuminates at...
Definition
if at least one boost pump drops below 3.5 psi +/- 0.5 psi
Term
"ENGINE OUT" illuminates at...
Definition
below 55% N1 +/- 3%
Term
VNE with gross weight <3000 lb?
Definition
130 kias and decreases by 3.5 kias per 1000' above 3000' density
Term
VNE with gross weight >3000 lb?
Definition
122 kias and decreases by 7 kias per 1000' above 3000' density
Term
VNE with forward doors off (training, no passengers)?
Definition
110 kias
Term
VNE with forward doors off (with passengers)?
Definition
69 kias
Term
VNE with rear doors off?
Definition
87 kias
Term
VNE when torque is 85%?
Definition
80 kias
Term
Max sideward and rearward airspeed below 3500' density and below 3000 lb?
Definition
30 kias
Term
Max sideward and rearward airspeed above 3500' density or above 3000 lb?
Definition
17 kias
Term
Max run-on landing speed?
Definition

10 kias

(really?)

Term
Max autorotation speed before rotor decay?
Definition
100 kias
Term
Max range autorotation speed at 90%NR?
Definition
69 kias
Term
Min autorotation descent rate at 90%NR?
Definition
52 kias
Term
Max wind on startup?
Definition
45 knots or 15 knots gust spread
Term
Altitude limitation at below 3000 lb?
Definition
Max of 20,000 ft Pressure Altitude
Term
Altitude limitation at above 3000 lb?
Definition
Max of 13,500 Density Altitude
Term
Engine oil pressure/temp limits?
Definition

Min 50 psi, max 130 psi, max 107˚C

Engine must stay idle until oil temp is above 0˚C and press is below 130 psi (could be a 150 psi on a cold start)

Term
Transmission oil limits?
Definition
Min 30 psi, max 70 psi, max temp 110˚C
Term
Fuel pressure limitations?
Definition
Min 4 psi, max 30 psi, both boost pumps must be running
Term
Loadmeter limitations?
Definition
At or below 8000' pressure max is 100%
Term
Torque limitation at take off?
Definition
100% for 5 minutes
Term
TOT max continuous?
Definition
738˚C
Term
TOT max at take off power?
Definition
738˚C to max of 810˚C (for 5 min)
Term
TOT max startup?
Definition
810˚C to 927˚C (for 10 sec)
Term
TOT transient limit?
Definition
810˚C to 843˚C (for 6 sec)
Term
What TOT defines a hot start?
Definition
810˚C to 927˚C for more than 10 sec or 927˚C exceeded
Term
N1 limitations at idle (gen off)?
Definition
60-62%
Term
N1 normal continuous operations?
Definition
60-105%
Term
Max transient N1?
Definition
106% for 15 sec
Term
N2 power on, normal operation?
Definition
97-100%
Term
N2 max above 30% torque?
Definition
100%
Term
Max N2 transient?
Definition
105% for 15 sec
Term
Nr with power on?
Definition
97-100%
Term
Nr no power (autorotation)?
Definition
90-107%
Term
Nr to avoid?
Definition
50-60% with cyclic neutral
Term
When to use rotor brake?
Definition
38-30% Nr
Term
Starter limitations no GPU?
Definition

40 sec on 60 sec off

40 sec on 60 sec off

40 sec on 30 min off

Term
Starter limitations with GPU?
Definition

25 sec on 30 sec off

25 sec on 30 sec off

25 sec on 30 min off

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