Lockheed Hercules C-130H, Руководство по квалификации/оценке, Страница: 43 / 59

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Engine Stop Start Criteria
Condition Stop Start Criteria
Within 5 seconds of
start switch actuation

START VALVE OPEN light does not illuminate

No rotation
35% RPM 
No Fuel Flow

No Ignition

No Engine or Gearbox oil pressure indication
Peak TIT < 720

Low TIT
Peak TIT > 850

Hot start
60 seconds

On speed (70 seconds in high temperatures)

Hydraulic Pressure indication
On Speed + 30 seconds

Full hydraulic pump pressure
TAXI
Taxing the C-130 is an acquired skill. In ground idle at 100% RPM, the propellers produce much
more thrust than necessary to keep the aircraft at a reasonable taxi speed. The maximum
recommend taxi speed on hard surface taxiways is
20
knots. Using wheel brakes alone to control
speed will rapidly overheat them. Reverse thrust works to control taxi speed, but in moderate to
hot temperatures, the engine oil temperature will quickly rise in reverse and must be carefully
monitored to avoid an over temperature. If your aircraft is equipped with oil cooler
augmentation, use of reverse thrust has less effect on oil temperature. If the oil temperatures
approach the limit, operating an engine at forward thrust (up to flight) idle will be required to
provide cooling, which places the aircraft back into a high forward thrust situation. When using
reverse, smoothly apply max reverse until you get the desired speed change, then return the
throttles to ground idle. If you only go part way back, you are only heating up the oil and won’t
see much
resultant slowing of the aircraft.
The use of low speed ground idle provides some relief. Low speed ground idle can be obtained
by asking the flight engineer to “down speed a pair” or “down speed all four.” The flight
engineer engages low speed ground idle (LSGI) by pushing the LSGI buttons located aft of the
throttle quadrant. In low speed ground idle, the compressor is unloaded by opening a bleed air
valve, resulting in the engine operating at 69-75.5% RPM. Depending on aircraft weight and
taxi surfaces, it is generally advantageous to taxi with a pair or all four engines in low speed
ground idle. When an engine is in low speed ground idle, the AC generator for that engine is
unavailable, so if conditions require all four engines to be down sped, the flight engineer will
need to start the APU to provide AC electrical power.
While in low speed ground idle, the pilot has only about two throttle-knob widths of throttle
movement either side of the ground idle detent before the engines return to regular ground idle.
If the pilot inadvertently advances/retards the throttle out of the low speed ground idle range, the
throttle should immediately be returned to the ground idle detent. Popping an engine out of low
speed ground idle is bad form in the C-130 community, as an engine bog down/stagnation is
possible, especially on hot days or at high density altitudes.