Bell 412 Emergency Proc

• Collective -- Reduce to maintain OEI limits.
• Airspeed -- 70 KIAS.
• RPM switch -- INCR; set NII RPM at 100%.
• Throttle (affected engine) -- Closed.
• Boost Pump switch (affected engine) -- OFF.
• Fuel switch (affected engine) -- OFF.
• Fuel XFEED switch -- OVRD CLOSE.
• Fuel INTCON switch -- OPEN.
• GEN switch (affected engine) -- OFF.
• Battery BUS 1 & 2 -- ON.
• MASTER CAUTION -- RESET.

If flameout was caused by a malfunction of the automatic mode of the fuel control unit.

• Throttle (affected engine) -- Closed.
• BOOST PUMP switch (affected engine) -- ON.
• FUEL switch (affected engine) -- ON.
• FUEL XFEED switch -- NORM.
• GOV switch (affected engine) -- MANUAL.
• GEN switch (affected engine) -- OFF.
• For battery start (non-assisted):
• BATTERY BUS switch (normal engine)-- OFF.
• BATTERY BUS switch (affected engine)--ON.
• START switch -- Engage.
• Throttle -- Open slowly at 12% NI until ITT begins to rise. Do not open throttle further until ITT & NI RPM stabilize.
• START switch -- Centered at 55% NI RPM.
• Throttle -- Increase slowly; adjust as required to control torque, ITT, and N1 RPM.
• NOTE -- Try to keep torque of affected engine 4% below torque of normal engine.
• GEN switches (both) -- ON.
• BATTERY BUS 2 switch -- ON.
• FUEL TRANS switch (affected engine) -- ON.
• FUEL INTCON switch -- NORM.

Collective pitch -- Reduce. Establish glide at 65 to 90 KIAS.

• Best angle of glide = 90 KIAS
• Minimum rate of descent = 65 KIAS

Accomplish autorotative landing.

If time permits before landing and a restart will not be attemped:

• Throttles (both) -- Closed.
• BOOST PUMP switches (both) -- OFF.
• FUEL switches (both) -- OFF.
• FUEL TRANS switches (both) -- OFF.

Low ENG RPM and ROTOR RPM (possibly with RPM warning light and audio if power demand is in excess of single engine power available).

TORQUE split (proportional to power demand).

Low GAS PROD RPM (N1), ITT, and TORQUE on affected engine.

• Collective -- Adjust as necessary to maintain ROTOR RPM.
• Airspeed -- 70 KIAS or as required to maintain flight within OEI limits.
• Affected engine -- Identify.
• Throttle frictions -- Tighten on normal engine; reduce on affected engine.
• GOV switch (affected engine) -- MANUAL.
• Throttle (affected engine) -- Increase slowly. Adjust throttle and collective as required to maintain TORQUE of affected engine slightly below TORQUE of normal engine.
• MASTER CAUTION light -- Reset.
• Land as soon as practical.

• High ENG RPM (NII) and ROTOR RPM, possibly with RPM warning light.
• Definite TORQUE split (proportional to power demand).
• High GAS PROD RPM (NI), ITT, and TORQUE on affected engine.
• Return of ENG RPM (NII) and ROTOR RPM to governed value (if power demand is high).

• Collective -- Adjust as necessary to maintain ROTOR RPM. >>>>>TRIPLE TACH<<<<<
• Airspeed -- 70 KIAS or as required to maintain flight within OEI limits.
• Affected engine -- Identify. >>>>>N1 & TOT<<<<<
• Throttle frictions -- Tighten on normal engine; reduce on affected engine.
• Throttle (affected engine) -- Reduce to flight idle.
• GOV switch (affected engine) -- MANUAL.
• Throttle (affected engine) -- Increase slowly. Adjust throttle and collective as required to maintain TORQUE of affected engine slightly below TORQUE of normal engine.
• MASTER CAUTION -- Reset.

NII and rotor RPM increase to approximately 101%.

RPM INCR-DECR switch inoperative.

If failure occurs during takeoff or landing, no immidiate corrective actions is necessary to complete either maneuver.

As soon as practical, roll back both throttle to maintain 97 to 100% NII RPM.

• Left yaw.
• Rapid decrease in Nr.
• Rapid increase in NII.
• Illumination of rotor RPM warning light with audio.
• Increase in noise due to:
• Overspeeding engine turbines.
• Overspeeding combining gearbox.
• Driveshaft breakage.

• Enter Autorotation.
• Throttles -- Close, if time permits.

• Engine 'pops'.
• High or erratic ITT.
• Decreasing or erratic NI and NII RPM.
• Torque oscillations.

• Hover:
• Land as soon as possible.
• In-flight:
• Collective -- Reduce, maintain slow flight. Avoid large, rapid increases in collective pitch.
• Heater switch -- Reposition.
• ITT and NI -- Check for normal indications.
• Land as soon as practical.

Flames emitting from the exhaust.

Excessive IT indication.

• Abort start of affected engine as follows:
• Throttle -- Closed; keep starter engaged.
• BOOST PUMP switch -- OFF.
• FUEL switch -- OFF.
• Starter -- Contintue to energize until ITT decreases.
• Complete shutdown.
• Exit helicopter and check for damage.

Engine oil temperature above limit of 120 degrees C.

• Collective, Airspeed -- As required.
• Throttle (affected engine) -- Idle.
• ENG switch -- INCR; set ENG RPM (NII) at 100% if possible.
• If condition persists:
• Throttle (affected engine) -- Close.
• Complete engine shutdown.
• Land as soon as possible.

• Abort start of affected engine as follows:
• Throttle -- Closed.
• FUEL XFEED switch -- OVRD CLOSE.
• BOOST PUMP switch -- OFF.
• FUEL switch -- OFF.
• Appropriate FIRE handle -- Pull.
• FIRE EXT switch -- MAIN.
• If FIRE warning light remains on more than 10 seconds:
• FIRE EXT switch -- RESERVE.
• Complete engine shutdown.
• Exit helicopter.

• Airspeed -- 45 KIAS minimum.
• Collective -- Reduce (altitude permitting).
• Appropriate FIRE PULL handle -- Pull.
• FIRE EXT switch -- MAIN.
• If FIRE warning light remains on more than 10 seconds:
• FIRE EXT switch -- RESERVE.
• NII RPM -- Set at 100%.
• Land as soon as possible.
• Complete engine shutdown.

• Initiate emergency descent immediately if possible.
• Shut down affected engine as follows:
• Approapriate FIRE PULL handle -- PULL.
• Throttle (affected engine) -- Closed.
• FIRE EXT switch -- MAIN.
• FUEL XFEED switch -- OVRD CLOSE.
• BOOST PUMP switch (affected engine) -- OFF.
• FUEL switch (affected engine) -- OFF.
• Fuel INTCON switch -- OPEN.
• If FIRE warning light remains on:
• FIRE EXT switch -- RESERVE.
• NII RPM (normal engine) -- Set at 100%.
• Land as soon as possible.

• VENT BLOWER switch -- ON.
• Vents and windows -- Open.
• If additional ventilation is required:
• Airspeed -- Reduce to 60 KIAS or less.
• Passenger doors -- Open.
• Land as soon as possible.

• Reduce power to minimum required.
• Land as soon as possible.
• Inspect tailboom area for damage.

Close throttles immediately and make a hovering autorotation landing.

• Close throttles and lower collective pitch immediately. Establish a glide speed slightly above normal autorotation approach speed.
• If a turn is required to reach a more desirable place to land or to align into the wind, make it to the right.
• Yaw can be controlled in the following manner:
• Right Yaw -- a pulse of up collective will produce more friction in the mast thrust bearings, creating a left moment.
• Left Yaw -- a slight addition of power should arrest it.
• Complete autorotation.

Do not close throttles unless a severe right yaw occurs. A landing from a hover can be accomplished with greater safety under power controlled flight rather than by closing throttles and entering autorotation.

• Maintain airspeed at or above 60 knots.
• Use a shallow to normal approach.
• At 60 to 75 feet AGL and when the landing area can be made, start a slow deceleration to arrive at the intended landing point with about 25 KIAS.
• At 2 to 5 feet AGL, slowly reduce throttle to overcome yaw effect and allow helicopter to settle.
• When aligned with the landing area, allow helicopter to touch down.

• Maintain about 60 knots during initial part of approach.
• On final, reduce throttles to minimum operating RPM (97% Nr) and simultaneously begin a slow deceleration so as to arrive at a point about 2 feet above the intended touchdown area as ETL is lost.
• At 2 to 5 feet AGL, use throttle slowly as necessary to maintain alignment with the landing area and to control yaw; do not allow helcopter to settle until alignment is assured, then touch down.

• Affected system -- Identify positively.
• HYDR SYS switch (affected system) -- OFF.
• NII RPM -- Set to 100%.
• MASTER CAUTION light -- Reset.
• Land as soon as possible.

• DC GENERATOR caution light illuminates.
• All lighting and avionics on non-essential buses inoperative.

• GEN FIELD and GEN RESET circuit breakers -- Check in.
• GEN switch (affected generator) -- RESET, then ON.
• If generator remains inop:
• GEN switch (affected generator) -- OFF.
• If No. 2 generator failed:
• Battery Bus 2 switch -- OFF
• Battery Bus 1 switch -- ON.
• NON-ESNTL BUS switch -- MANUAL.
• DC AMPS -- Monitor: if load exceeds limit:
• NON-ESNTL BUS switch -- As desired. Switch off unnecessary equip.
• If both gens fail:
• Emergency load switch -- As desired.

No. 1 or No. 2 INVERTER caution light illumintes.

Possible loss of power to certain AC instruments (with no INVERTER caution light).

• If either INVERTER caution light illuminates, proceed as follows:
• AC voltmeters -- Check to determine that remaining inverter has assumed all AC loads.
• INV PWR circuit breakers -- Check in.
• AP 1 or AP 2 button (affected system) -- Depress to reengage autopilot.

• Usable fuel will be approximately 60 pounds less than indicated per failure.
• If pracitcal descend below 5000' Hp.
• FUEL INTCON switch -- OPEN.

• FUEL QTY circuit breaker -- Recycle (affected side).
• FUEL INTCON switch -- OPEN.
• Obtain fuel load by doubling remaining fuel quantity indicated.

• Airspeed -- Reduce to 115 KIAS or less.
• INV 1 and 2 switches -- ON; check NO. 1 and NO. 2 INVERTER caution lights extinguished.
• Pilot and copilot ADIs -- Check ATT FAIL flags retracted, indicators functionin properly.
• Check all circuit breakers in.