C4602

=AFCS failure= The FCS inverter receives power from the essential No. 1 bus and is protected by the FCS circuit breaker (Figure 2-13). The FCS inverter supplies power to the automatic flight control system.

If the Stab fails mid flight (probably turned off by your instructor on downwind) there is no procedure so follow your Natops brief: A system failure is non-imediate in nature, discuss as a crew how to handle it i.e. check your pinky switch, instruct the PNAC to try his and the box, instruct him to check the circuit breaker. If it hasn't been fixed by the time you roll out on final instruct the PNAC to cease trouble shooting and keep eyes out for landing and delay further trouble shooting until you are on the deck.

FCS Caution light
 * Indicates Failure of AFCS fault protective circuits.
 * If light continues to illuminate, push STAB button off, pull FCS circuit breaker.

FCS Inverter Failure
INDICATIONS: Note: FORCE TRIM will function.
 * FCS light flashes
 * Loss of pitch/roll servos
 * Loss of FCS.

PROCEDURES: If FCS inverter voltage is less than 111 volts:
 * 1. FCS circuit breaker (ESS-1, lower panel) Pull.
 * 2. Establish VMC.

Avionics Inverter Failure
INDICATIONS: PROCEDURES: Note: Further flight in IMC is possible, but must be accomplished without RMIs and yaw servo.
 * AC voltage drop
 * RMI — needles failing in the VOR position
 * YAW servo failure.
 * 1. AVIONICS INVERTER circuit breaker (ESS-2, upper avionics panel) — Pull.

=Hydraulic System Failure= 14.22 HYDRAULIC SYSTEM MALFUNCTIONS The emergency procedure for hydraulic failure, when AFCS is being used, is the same as the procedure without AFCS. With force trim and AFCS ON, however, the workload necessary to maintain required control is greatly reduced. The aircraft can best be flown when attitude and power adjustments are made smoothly, gradually, and in small increments. IFR speeds of 70 to 90 knots can easily be managed with no hydraulics if force trim and AFCS are ON. For landing with a hydraulic malfunction, the ALT mode of the AFCS shall be disengaged.

Note: Odd or unusual stick forces will be felt in a boost-off situation. Because of excessive forces required for control manipulation, a shallow approach with a sliding landing is recommended.

Hydraulic System Failure
INDICATIONS: PROCEDURES: *1. Airspeed — Adjust (to obtain most comfortable control movement level) Read ep intro; states 70-90 KIAS for IFR. *2. HYDRAULIC BOOST switch — Check ON. *3. HYD BOOST circuit breaker — Out. If system is restored: 4. Land as soon as practicable. If system is not restored: 5. HYD BOOST circuit breaker — In. 6. HYDRAULIC BOOST switch — OFF. 7. FORCE TRIM (FT) — ON. 8. AFCS STAB — ON. 9. AFCS ALT — OFF. 10. Land as soon as practicable.
 * HYDRAULIC PRESSURE light
 * Increased force required for control movement
 * Feedback in control.

=Hydraulic Power Cylinder Malfunction.= INDICATIONS: PROCEDURES: *1. HYDRAULIC BOOST switch — OFF. WARNING: Hydraulic system will not secure if HYD BOOST circuit breaker is out. *2. Helicopter — Regain Control. *3. Airspeed-Adjust as desired to obtain most comfortable control movement level. *4. Land as soon as possible. WARNING: In the event of a complete power failure in the TH-57B or a failure of the ESS No. 2 bus in the TH-57C, the hydraulic system will reenergize in the malfunction mode. The pilot will be unable to override the hydraulic boost solenoid.
 * Cyclic/collective control displaces to abnormal position.
 * Pilot control of cyclic/collective is difficult or impossible.

=Post-refuel/hot seat checklist= 7.21 HOT REFUELING/HOT SEATING
 * Helicopters have the unique ability to refuel/change crews while the rotors are engaged in order to expedite mission accomplishment.

Hot Refuel Checklist.
When in the fuel pits:
 * 1. VHF radio — OFF.
 * 2. Navigation equipment — OFF.
 * 3. Transponder — OFF.
 * 4. Radar altimeter circuit breaker — Pull.
 * 5. DME circuit breaker — Pull.
 * 6. Searchlight/landing light — OFF.
 * 7. Twist grip — FLT IDLE.
 * 8. STAB — OFF.
 * 9. Crew/passengers — Disembark.
 * 10. Monitor UHF radio and make no transmissions, except in an emergency, while the fuel nozzle is attached to aircraft.

Post-Refuel/Hot Seat Checklist.
Hot Seat Only: 5. Flight controls — Check. 6. COMM/NAV equipment — Tune. 7. TRQ and TOT C/Bs — Pull and reset. Note any exceedence. 8. Flight instruments — Check.
 * 1. Desired COMM/NAV equipment — ON.
 * 2. Transponder — STBY.
 * 3. Radar altimeter circuit breaker — In.
 * 4. DME Circuit Breaker — In.
 * 9. Normal/recover switch — Check.
 * 10. Takeoff Checklist — Perform.

=Transmission Chip Light= Instruments — Check transmission instruments for secondary indications of impending failure. If these indications exist, execute Imminent Transmission Failure procedures. If no secondary indications exist, proceed as follows: First chip light—Press CLEAR CHIP; If TRANS CHIP light goes out, note the time and continue flight. If TRANS CHIP remains illuminated, land as soon as possible. Second chip light—If within 30 minutes of the first, land as soon as possible. If more than 30 minutes have elapsed since the first light, press CLEAR CHIP and proceed as with the first light. Any subsequent chip light — If within 50 flight hours of the first, land as soon as possible and make no attempt to clear chip. All chip lights shall be documented on a VIDS/MAF

Remember that a transmission chip light may quickly turn into:

IMMINENT TRANSMISSION FAILURE
If abnormal transmission temperature or pressure indications are accompanied by the illumination of the TRANS CHIP light or abnormal sound from the transmission area: *1. Land immediately. Do not autorotate; minimize power changes. *2. Lock harness.

If you are concerned about your transmission and are trying to limp it home, the smart choice is "low and slow" to allow you to successfully complete the above EP if it becomes necessary.

=Sprag Clutch Slippage= Sprag clutch slippage may occur following power−off maneuvers in which Nr and Nf have been split. When the twist grip is increased to full open, the pilot may experience the following indications: Nf indication higher than Nr. Low torque indication. Ng and TOT indications lower than normal and not responsive to collective. Procedures: *1. Autorotate. *2. Twist grip — FLT IDLE. If time and altitude permit: *3. Twist grip — Smoothly rotate to full open. If Nf/Nr are married: *4. Collective — Increase. If sprag clutch continues to slip: *5. Autorotate. *6. Twist grip — Closed. If the sprag clutch reengages: *7. Land as soon as possible. CAUTION After completing the autorotative landing, ensure the twist grip is secured. Failure to do so may result in sudden reengagement of the sprag clutch, causing severe damage to the drive system. Note: Multiple attempts to reengage the sprag clutch are permitted dependent on time and altitude.