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14 Cards in this Set

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105.1 State the type, model, and characteristics of the engine used in the MH-60S.
T700-GE-401C. Is a front-drive turboshaft engine, manufactured by General Electric Company. The engine incorporates and integral inlet particle separator and modular construction. At sea level and 59 degrees (15C), the T700-GE-401C engine has a maximum continuous shaft horsepower (shp) rating of 1,662, an intermediate shp rating of 1,800 for a 30 minute duration, and a selectable contingency power rating of 1,940 shp available for 2-1/2 minutes duration.
Define the following acronyms/abbreviations.
a)DEC
b)ESU
c)HMU
d)LCF
e)LDS
f)Ng
g)Np
h)Nr
i)P3
j)PAS
k)T2
l)TGT
a)DEC – Digital Electronic Control
b)ESU – Electronic Sequence Unit
c)HMU – Hydro-mechanical Unit
d)LCF – Low-cycle Fatigue
e)LDS – Load Demand Spindle
f)Ng – Gas Generator Turbine Speed
g)Np – Power Turbine Speed
h)Nr – Main Rotor Speed
i)P3 – Compressor Discharge Pressure
j)PAS – Power Available Spindle
k)T2 – Compressor Inlet Temperature
l)TGT – Turbine Gas Temperature
State the three different pneumatic sources for engine starts.
APU, engine cross-bleed air, or external pneumatic power (huffer).
105.4 State the purpose of the Inlet Particle Separator (IPS).
The AGB driven IPS blower separates dust, sand, and foreign objects from the engine inlet airflow providing clean air to the engine.
105.5 State the purpose of the Hover Infrared Suppression System (HIRSS).
HIRSS contains a three-stage core and inner baffle which reduces exhaust gas radiation and prevents line of sight viewing of hot engine surfaces. The three-stage core and inner baffle cold surface are coated with low-reflectance material.
105.6 State the five main components of the MH-60S power train.
a)Main Transmission Modules
b)Drive Shaft
c)Oil Cooler
d)Intermediate Gearbox
e)Tail Gearbox
105.7 State the primary and secondary function of the main transmission system.
a)Primary – Take the combined power from the two engines, reduce the rpm, and transfer it to the main and tail rotors.
b)Secondary – Is to provide a drive for electrical and hydraulic power generation.
105.8 State the purpose of the chip detectors used on the MH-60S.
Attract loose metal chips in the engine, intermediate and tail gear boxes, and transmission oil. There are nine detectors in the system. There is one for each engine, one each in the TGB and IGB and five for the main transmission. All chip detectors, except those for the engines, have a fuzz burn-off feature that burns off small particles. This is to avoid nuisance warnings.
105.9 State the purpose of the Auxiliary Power Unit (APU).
Supplies power that starts the main engines and provides air to the Environmental control System (ECS) for cabin heating and cooling. The APU provides limited electrical power for ground operations, in-flight emergencies and backup hydraulic pump power.
105.10 State the purpose of the APU accumulator and the two methods of charging.
The accumulator provides the hydraulic pressure required by the APU hydraulic starter. If the APU does not start, the accumulator may be manually recharged with a hand-pump or the backup hydraulic pump (electric).
105.11 State the purpose of the history recorder/counter.
a) Recorder – Is used in conjunction with the ECU and mounts on the engine swirl frame. Signals are applied to the history recorder from the ECU. The recorder supplies two readouts of Low Cycle Fatigue (LCF), a time-temperature index, and engine operating hours. These readouts cannot be reset to zero. The history recorder is used to determine maintenance events on the engine.

b) Counter – Is used in conjunction with the DEC and mounts on the engine swirl frame. Digital impulses are sent to the history counter by the DEC. The counter displays four non-resettable readouts: two readouts for LCF events, another for a time-temperature index, and a fourth readout for engine operating hours.
105.12 State the types of fuel the T700 engine uses and their restrictions.
a) JP5/JP-8: establish IGE hover (nose up at 20 feet or less) for 10 seconds prior to takeoff following sustained nose down ground operations in excess of 10 minutes.
b) JP-4/Jet B: Single engine training is prohibited. Due to the vapor qualities of mixed JP-4/Jet B and a primary fuel, the next two refuelings shall be treated as if it were JP-4/Jet B.
105.13 State two conditions that would require an engine compressor cleaning
When engine performance has deteriorated to an unacceptable level or whenever visual or bore-scope inspection reveals an accumulation of dirt, salt, or oil based deposits, etc., that have built up within the engine.
105.14 State the goals of the Vibration Analysis Program.
To avoid catastrophic failures thereby increasing aircraft availability, reducing aircraft repair cost and improving aviation safety. To provide insight assistance in troubleshooting vibration discrepancies thereby reducing maintenance man-hours, removal of serviceable components and help determine the cause of chronic failures. To ultimately plan repairs/component replacement thereby improving repair quality, reducing operating expenses and allowing timely ordering of replacement parts. To prevent unnecessary periodic disassembly for inspection.