Flight Line Supplement

Question 1

Engine Alternator - INE

Answer 1

• Ignition power to the editors during start
• Ng signal to the cockpit
• ECU power

*loss of alternator does not result in high side failure of ECU

Question 2

HMU - PM CAN VETO

Answer 2

• Pumps fuel at high pressure
• Meters fuel in response to PAS, LDS, ECU (TQ motor), & engine variables
• Collective pitch compensation through LDS. When collective is moved, Ng is reset for immediate Np response.
• Accel/Decel fuel flow limiting prevents compressor stall and flameout
• Ng limiting. Limits MTA @ low temps
• Variable geometry positioning of the inlet guide vanes for optimum performance
• ECU lockout. PAS override control w/ECU ions. Pilot can bypass TQ motor inputs
• Torque motor to trim Ng output. fine tune engine output. Override through lockout
• Opens vapor vents for manual HMU priming, to remove air from HMU

Question 3

Stabilator - SCALP

Answer 3

• streamlines w/rotor downwash @ low speeds (> 30 kts) to min. nose up attitude
• collective coupling to minimize pitch attitude excursions from collective inputs, above 30 kts
• Angle of incidence decreases above 30 kts. To improve static stability
• Lateral sideslip to pitch coupling to reduce susceptibility to gusts. Stab up for right pedal, stab down for left pedal
• Pitch rate feedback to improve dynamic stability. Dampen pitch excursions due to turbulence or G forces

Question 4

MMU

Answer 4

• collective to pitch - rotor downwash
• collective to roll - translating tendency
• collective to yaw - torque effect
• yaw to pitch - lift component of tail rotor

Question 5

DEC - IN FLT HHOT

Answer 5

• Isochronous Np governing. DEC will maintain Np reference
• Np reference from the cockpit (96-100%)
• Fault indication. DEC code sent to corresponding ENG TQ indicator
• Load Sharing/Torque Matching. Match TQ within 5%. Increase TQ of low side to match up to 3% Np above reference
• Transient Droop improvement. 4-1 improvement to compensate for transient rotor droop
• History counter. Maintenance function
• Hot start preventer. Tells ODV to shut off fuel when TGT reaches 900oC (NG < 60%, Np < 50%)
• Overspeed protection. Triggered when Np reaches 120% +/- 1%
• TGT limiting. Limits fuel flow @ approx. 866oC. Contingency power (2.5min) @ approx. 891oC (when other TQ < 50%)

Question 6

ODV - HOPS

Answer 6

• Hot Start Preventer. Tells ODV to shut off fuel when TGT reaches 900oC (Ng < 60%, Np < 50%)
• Overspeed protection (Np) From DEC @ 120% +/- 1%
• Purges main fuel manifolds and allows back flow of high-pressure air purging
• Sends fuel through manifold to injectors for starting and operation