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Systems 2: Engine
Terms in this set (32)
Digital Electronic Control (DEC)
solid state device mounted below the compressor casing which controls the electrical function of the engine and transmits operational information to the cockpit.
Both DEC's share one piece of information which is:
Significance of the Enhanced Digital Engine Control (EDECU)
ensure that the DAS plug is installed on the EDECU when installed on the UH-60M. If it is not installed, the 701D engine will operate with 701C limiting values reducing torque available
Hot Start Preventer (HSP)
HSP is a function of the DEC and overspeed drain valve (ODV) that automatically prevents over temperature during starts by shutting down the engine.
Hydromechanical Unit or HMU
Controls the fuel to the combustion system.
Load demand spindle (LDS)
The LDS changes linear cable movements into rotary motion. The LOWER one connected to collective.
The Engine PCL operates this
Power Available Spindle (PAS)
PAS and LDS are 2 mechanical inputs of...
HMU which provides variable geometry in the axial compressor.
This section of the engine powers all of the accessory gear box components through the power takeoff drive assembly: Oil Temp Sensor, Oil Pressure Sensor, Alternator, Oil Pump, Oil Filter Bypass Switch
NG is displayed on the EICAS page; only after NG exceeds
NG and NP
These are two operational components of the engine. They are not connected mechanically
____ is mechanically connected to ____ by the high-speed drive shaft, input module, and the main module of the transmission. One-way mechanical connection via the free-wheeling unit
The indication is not reportable below (-20°C).
Difference with the engine oil temp gauge
This consists of 5 axial and 1 centrifugal rotors for a combined 6 stages
Alternator, reverts to airframe power
This is the primary source of electrical power to the engine and what happens after a failure?
Cold, hot, power turbine, accessory gear box
Four modules of the T700-GE-701D engine
Liquid to liquid cooler, oil flow through the scroll vanes
How does engine oil cool?
These provide an emergency backup oil system
oil reservoirs built into the A and B sumps
ENG OUT warning light and audio, and 0% NG
If NG signal is lost, what happens?
It assures that the airframe fuel supply system is under negative pressure, lessening the potential of fire in case of fuel system damage.
What is special about the engine driven boost pump?
NP over speed protection
This still works after DEC/EDECU Lockout
provides pneumatic source for individual and dual engine starts
You must pull down on the engine PCL to disengage the starter
How do you manually disengaged the starter?
Yes, within certain temperature ranges
Is the APU capable of starting both engines simultaneously?
At what NG should the starter caution disappear?
No TGT within 45s, no engine oil P within 45s, no NP within 45s, engine starter on caution appears before 52%, TGT reaches 851% before idle is attained.
Abort start criteria (NNNET)
Two engine fuel system selector levers three positions:
The torque matching/load sharing system.
What system keeps the engines at an approximate equal torque?
Available 4o C and below, May or may not be available 4o - 13o C, Not available 13o C and above
Engine Inlet Anti-Icing System temperatures
The hot engine oil also provides a passive anti-ice function
Other than bleed air, what is used to assist in engine anti-ice functions?
-20%. With cockpit gunner heater on reduce another 5%
With engine anti ice activated how much should maximum Q available be reduced?
Upturned Exhaust System (UES)
This Tries to help against IR missiles, must be accounted for in PPC, rotor wash dissipates hot exhaust
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