When switching from normal to analog and from analog to normal, the aircrew will notice a momentary drop in Nr/Np in powered flight (collective applied).
TRAINING AND EVALUATION REQUIREMENTS:
Training. Training will be conducted in the aircraft. The following tasks may be performed while in the ESC BACK UP mode:
Evaluation. Evaluation will be conducted in the aircraft. The following tasks may be performed while in the ESC BACK UP mode:
Task 1038, Perform hovering flight. (IGE only)
Task 1040, Perform VMC takeoff.
Task 1052, Perform VMC flight maneuvers.
Task 1058, Perform VMC approach.
Task 1062, Perform slope operations.
Task 1072, Respond to engine failure at a hover.
Task 1082, Perform autorotation.
Task 1176, Perform non-precision approach (GCA).
Task 1178, Perform precision approach (GCA).
Task 1180, Perform emergency GPS approach (GPS, INS, EGI as applicable to the airframe) (AHRS or EGI).
Task 1182, Perform unusual attitude recovery.
REFERENCES: Appropriate common references.
PERFORM MANUAL THROTTLE OPERATIONS (FADEC)
“Underspeed below 95% NR can cause unrecoverable rates of descent during final approach. Instructor Pilots must be prepared to take corrective action anytime it becomes apparent the standards will be exceeded”
CONDITIONS: In an OH-58D(R) helicopter with an IP, with the MMS off, during the day only, winds 20 knots or less, maximum gust spread of 10 knots, and no more than light turbulence.
STANDARDS: Appropriate common standards plus the following:
Recognize the emergency, and determine the appropriate corrective action.
Perform or simulate, from memory, all immediate action procedures outlined in TM 55‑1520‑248‑CL.
Maintain RPM (NR/NP) 100% ± 5%.
Smoothly coordinate throttle and collective controls.
In the Manual mode, NP governing, TGT limiting, engine torque limiting, limit override logic, engine surge detection/avoidance, and flameout detection/auto-relight are not available. Make smooth and controlled throttle and collective adjustments to maintain operating limits. Closely monitor NR/NP.
The crew must divide their attention to maintain airspace surveillance, obstacle avoidance, and maintain RPM within limits. The IP will inform the P* of all obstacles and will confirm aircraft clearance during all turns. The IP will provide adequate warning for corrective action if maximum engine operating limits may be exceeded. The IP/P will manipulate the FADEC AUTO/MANUAL push-button switch as required and acknowledge any intent to deviate from the planned maneuver.
The P* will remain focused out side the aircraft during the maneuver. He will coordinate with the P for manipulation of the FADEC AUTO/MANUAL switch.
The P will perform as directed by the P* when switching to and from the AUTO and MANUAL position. During the maneuvers he will provide obstacle avoidance and announce when he is focused inside the aircraft.
Switching from Automatic to Manual Mode on the Ground - While the aircraft is on the ground with the throttle reduced to idle and the collective full down, press the FADEC AUTO/MANUAL button to the MANUAL position. Adjust the throttle to 100% NR. Bring the aircraft to a stabilized hover while adjusting the throttle carefully to maintain RPM.
When switching from Automatic to Manual mode the aircrew may notice either an increase or a decrease in NR/NP. When switching from Automatic to Manual mode at a hover/in flight the aircraft will be positioned over a suitable forced landing area. When switching from Automatic to Manual mode in flight, maintain an altitude that will ensure obstacle clearance should there be a decrease in NR/NP.
Switching from Automatic to Manual Mode in Flight (Failed Fixed Simulation) - While the aircraft is at a stationary hover or in level flight with cruise power applied, the IP will announce “FADEC FAIL”. React to the FADEC failure by reducing the throttle as appropriate for the conditions and maintain the collective position. Then press the FADEC AUTO/MANUAL button to the MANUAL position. Then smoothly adjust the collective as necessary to gain control of the RPM. Adjust the throttle and collective as necessary to maintain RPM.
Switching from Automatic to Manual Mode in Flight (Failed to Manual Simulation) - While the aircraft is at a stationary hover or in level flight with cruise power applied, press the FADEC AUTO/MANUAL button to the MANUAL position. React to the FADEC audio tone by immediately reducing the throttle as appropriate for the conditions Smoothly adjust the collective as necessary to gain control of the RPM, then adjust the throttle and collective as necessary to maintain RPM.
Switching from manual to automatic mode in flight should not be accomplished with the nr below 96%. This prevents rapid torque increases, which may exceed limitations.
Switching from Manual to Automatic Mode - Switching the FADEC to the Automatic mode may be performed on the ground, (with the throttle reduced to idle and the collective full down), at a hover or in flight. To switch to the Automatic mode press the FADEC AUTO/MANUAL button to the AUTO position. Confirm that the AUTO legend on the button is illuminated then adjust the throttle to the full open position while ensuring that the FADEC system operates properly and maintains 100% NR.
In the manual mode the collective is the most effective means of controlling NR due to reduced throttle response rates.