Equip available with battery power only:
CVR/FDR, Pilot inboard MFD, Pilot FMS, Pilot FDDCP, #2 ADC, #2 DCU, #2 EGI, #1 stab actuator (manual), ICS, clock, #1 FM, VHF, VOR/ILS, IFF, Radar Altitude, Searchlight, Standby Compass light, cockpit utility lights, APU system control, fire detector/extinguisher, audible warning, SAS control, fuel transfer, jettison, backup pump control, hook release
ODV
HOPS
- Hot Start Prevention shuts fuel flow at 900°C, NG <60%, NP <50%.
- Over-speed protection (NP) from DEC at 120+1%
- Purges main fuel manifold and allows back flow of high-pressure air for purging.
- Sends fuel through manifold to 12 injectors for starting, acceleration, engine ops.
Fuel Flow in the Engine
- Pump (engine driven)
- Fuel filter
- HMU
- Liquid to liquid cooler
- ODV
HMU
Basic fuel control; incl. high pressure fuel pump & variable geometry servo-actuator.
(PM CAN VDTO)
- Pumps fuel at high pressure
- Meters fuel to ODV in response to PAS, LDS, torque motor from DEC, & engine variables.
- Collective Pitch Compensation through the LDS. When the collective is moved, NG is reset for immediate NP response.
- Acceleration/Deceleration flow limiting preventing compressor stalls, engine damage, or flame out.
- NG limiting – Limits max torque available under low temp conditions.
- Variable Geometry Positioning of the inlet guide vanes for optimum performance.
- DEC/EDECU lockout PAS Override & Control with DEC/EDECU Inoperative. Allows pilot to mechanically bypass torque motor inputs.
- Torque Motor to Trim NG Output. To fine tune engine output. Can be overridden in DEC lockout.
- Opens Vapor Vent for manual HMU priming, to remove air from HMU.
Weight-On Wheels Switch
CHAFF AIM TUBE
- CVR/FDR: IBIT, erase on ground
- Hydraulic leak test disabled in fight.
- Audio for low NR disabled on the ground.
- Flight Dir. Modes enabled in-flight
- FMS-Model aircraft, EGI GC or GPS alignment IBIT on ground/ EGI air alignment in flight
- AFCS- Pitch, Roll Attitude hold/ Heading hold/ Maneuvering Stab/ Radar Alt hold/ Airspeed hold – Enabled in-flight.
- IFF Mode 4-Auto Zeroize enabled in flight.
- MFD status page activation on ground
- Thermal protection for B/U pump enabled on the ground.
- Under frequency protection disabled in flight. (right switch)
- B/U Pump will come on in flight automatically if needed regardless of switch position. Feature disabled on ground unless the accumulator is low
- ESSS jettison disabled on ground. (right switch)
DEC
Controls electrical functions of engines and transmits operation info to cockpit.
(IN FLT HHOT)
- Isochronous NP Governing. DEC will maintain NP reference
- NP Reference from the cockpit, (INCR/DECR from 96-100%)
- Fault Indication. DEC code sent to corresponding ENG Q indicator and the FMS DEC status page.
- Load Sharing/Torque Matching. Increase Q of low side to match up to 3% NP above reference.
- Transient Droop Compensation. 4-1 improvement to compensate for transient rotor droop. Uses coll. pos. transducer signal.
- History Counter. Sends signals to History Counter.
- Hot Start Preventer. Tells ODV to shut off fuel when 900°C is reached, NG<60, NP<50.
- Overspeed Protection. Triggered when NP reaches 120±1%.
- TGT Limiting. Limits fuel flow when reaching approx. 879⁰ dual engine, 903⁰ (2½min) when opposite Q is < 50%.
Engine Alternator
Three windings for three functions:
- NG signal to cockpit tachometer. (green)
- Ignition power to the exciters during start. (yellow)
- DEC power. (yellow) Loss of alt. does not result in high side failure
AFCS
Enhances static stability and handling qualities of the helicopter; autopilot Five subsystems:
- SAS
- Trim
- FPS
- Stabilator
- Coupled Flight Director
What does AFCS do?
AFCS enhances the stability and handling qualities of the helicopter and provides autopilot functions.
What does Stability Augmentation System (SAS) do?
provides short-term rate dampening in pitch, roll, and yaw axis.
What does Trim do?
provides control positioning and force gradient functions.
What does FPS do?
basic autopilot functions when coupled with trim.
What does Coupled Flight Director do?
provides a means for the pilot to select defined autopilot functions, automatic flight control positioning, and provides steering cues for display on the MFD when coupled.
What does Stabilator do?
improves flying qualities with the use of electromechanical actuators in response to collective, airspeed, pitch rate, and lateral acceleration inputs.
What is the primary function of the EGI?
The primary function of the EGI is to compute attitude, heading, present position, and turn rate data.
