CH146 Red Pages Emergency Procedures

Vocabulary flashcards covering the emergency procedures, immediate actions, indications, and limitations outlined in the CH146 Red Pages checklist.

Engine Hot Start

Condition: $1090^\circ\text{C}$ or $940^\circ\text{C}$ for more than $2\,\text{sec}$.

Throttle affected engine CLOSE,

Starter ENGAGED,

FUEL switch (affected engine) OFF,

Starter DISENGAGE WHEN ITT $<300^\circ\text{C}$,

Shutdown COMPLETE.

Engine False Start

Condition: No Light-off within $15\,\text{seconds}$, or hang up on start ($N_1$ never reaches $55\%$). Actions: Throttle (affected engine) CLOSE, Starter DISENGAGED, FUEL switch (affected engine) OFF, BOOST PUMP switch (affected engine) OFF.

Emergency ground egress

Procedure: Throttles CLOSE; BATTERY BUS Switches OFF; Rotor Brake AS REQUIRED; Door OPEN/JETTISON; Exit aircraft.

Engine Fire - On ground

Procedure: Both throttles CLOSE; FIRE PULL handle (affected engine) PULL; FIRE EXT switch MAIN, THEN RESERVE; Emergency ground egress.

Engine Fire - In Flight

Procedure: Emergency decent INITIATE IMMEDIATELY, IF POSSIBLE; Collective, airspeed AS REQUIRED; FIRE PULL handle (affected engine) PULL; FIRE EXT switch MAIN; BEEP MAX; If FIRE warning light still on after $10\,\text{seconds}$: FIRE EXT switch RESERVE; Land as soon as possible.

Single Engine Failure - In Hover

Procedure: Helicopter CONTROL; BEEP MAX; Collective RAISE TO CUSHION.

Single Engine Failure - In Flight

Procedure: Collective, airspeed AS REQUIRED; BEEP MAX; Torque, $N_1$, triple tach, ITT CHECK; Single engine shutdown in flight, Tab 3.

Dual Engine Failure

Procedure: Autorotate, airspeed AS REQUIRED. If restart will not be attempted: Throttles CLOSE; FUEL switches OFF; BOOST PUMP switches OFF; FUEL TRANS switches OFF; Crew, pax BRIEF.

Compressor Stall

Condition: Insufficient air in combustion chamber, ITT high, loss of power and 'popping' sounds. Actions: Collective, airspeed REDUCE; HEATER switch REPOSITION. If condition persists: Throttle (affected engine) IDLE; BEEP MAX; Land as soon as practical. If condition persists: Single engine shutdown in flight, Tab 3.

N2 Turbine Seizure or Failure

Condition: Engine power turbine or drive to C-BOX has seized or failed; Low $N_2$ and QE, High $N_1$ and ITT. Actions: Collective, airspeed AS REQUIRED; Throttle (affected engine) IDLE; BEEP MAX; Single engine shutdown in flight, Tab 3.

High or Low Side Governor Failure - On Ground

Condition: HIGH SIDE: Fuel control failure causing engine runaway on affected engine (high $N_r$, $N_2$, $N_1$, and ITT); LOW SIDE: Fuel control failure causing affected engine to produce less than required torque (low Q and low $N_r$). Actions: Both throttles CLOSE; Shutdown COMPLETE.

High or Low Side Governor Failure - In Flight

Condition: HIGH SIDE: Engine runaway on affected engine (high $N_r$, $N_2$, $N_1$, ITT); LOW SIDE: Engine produces less than required torque (low Q and low $N_r$). Actions: Collective ADJUST TO MAINTAIN ROTOR RPM; Affected engine IDENTIFY; Throttle (affected engine) IDLE. If throttle reduction has no effect or manual fuel control is desired: GOV switch (affected engine) MANUAL; Throttle (affected engine) OPEN SLOWLY AS REQUIRED.

Electrical Fire (VMC, below 5000ft)

Procedure: BATTERY BUS switches (1 and 2) OFF; GEN switches (1 and 2) OFF; Land as soon as possible.

Electrical Fire (Continued flight is necessary IMC or VMC and below 5000ft)

Procedure: Emergency load switch EMERG LOAD; GEN switches (1 and 2) OFF; BATTERY BUS switches (1 and 2) ON; Timer Start. (Note: Approximately $67\,\text{min}$ of battery power is available with the emergency load switch in EMERG LOAD).

Battery Temp - Red

Condition: Battery temperature has reached $71^\circ\text{C}$ ($160^\circ\text{F}$); treat as thermal runaway. Actions: BATTERY BUS switches OFF; Visors DOWN; Land as soon as possible; Egress AWAY FROM NOSE.

Dual Generator Failure

CAUTION: Do not select EMERG LOAD at pressure altitudes above $5000\,\text{feet}$ ($1524\,\text{m}$). Both fuel boost pumps will become inoperative, resulting in possible fuel starvation.

Main Driveshaft Failure

Condition: Driveshaft powering the transmission has failed. Actions: Autorotate AIRSPEED AS REQUIRED; Throttles CLOSE; Fuel switches OFF; Crew, pax BRIEF.

Loss of Tail Rotor Thrust - In Hover

Condition: Loss of yaw control due to failure of tail rotor power train, control linkages or tail rotor components. Actions: Throttles IDLE; Collective RAISE TO CUSHION LANDING.

Loss of Tail Rotor Thrust - In Flight

Condition: Loss of yaw control due to failure of tail rotor power train, control linkages or tail rotor components. Actions: Collective REDUCE TO MINIMUM. If yaw is uncontrollable: Throttles IDLE; Autorotate $70\,\text{KIAS}$ MINIMUM; Carry out autorotative landing.

Loss of Tail Rotor Control - In Hover

Condition: Tail rotor pitch is frozen at a particular pitch setting due to a stuck pedal or other linkage failure. Actions: Collective LOWER GENTLY AND LAND.

Loss of Tail Rotor Control - In Flight

Condition: Tail rotor pitch is frozen at a particular pitch setting due to a stuck pedal or other linkage failure. Actions: Collective, airspeed ADJUST AS REQUIRED; Check for FOD BOTH SIDES; Pedal position CHECK; Throttle frictions AS REQUIRED; Controllability CHECK; Approach SHALLOW TO NORMAL.

Sprag Clutch Non-Engagement

Condition: No engagement of combining gearbox sprag clutch assembly to positive drive following start (indicated on 1st start by zero $N_r$; on 2nd start by $10\%$ to $15\%$ higher $N_2$ than engaged engine and near zero torque). Actions: Both throttles CLOSE; Shutdown COMPLETE. NOTE: Indications of a sudden (hard) engagement are abrupt $N_2$ deceleration, jolt or noise.

XMSN Oil Pressure

Condition: Pressure less than $30\,\text{psi}$. Actions: Power REDUCE; XMSN oil pressure, temperature CHECK; If outside limits Land as soon as possible; If within limits Land as soon as practical. NOTE: For any transmission problems, minimize power changes.

XMSN Oil Temperature

Condition: Temperature above $110^\circ\text{C}$. Actions: Power REDUCE; XMSN oil temperature, pressure CHECK; If outside limits Land as soon as possible; If within limits Land as soon as practical. NOTE: For any transmission problems, minimize power changes.

C-BOX Oil Pressure

Condition: Pressure less than $40\,\text{psi}$. Actions: Power REDUCE; C Box oil pressure, temperature CHECK; If outside limits Land as soon as possible; If within limits Land as soon as practical. NOTE: The $21\text{-psi}$ value at which the warning light illuminates is well below the system operation minimum of $40\,\text{psi}$; rely on the C-BOX gauge.

C-BOX Oil Temperature

Condition: Temperature above $120^\circ\text{C}$ max. Actions: Power REDUCE; C Box oil temperature, pressure CHECK; If outside limits Land as soon as possible; If within limits Land as soon as practical.

Rotor Brake

Condition: Rotor brake pucks not fully retracted. Actions: Rotor brake handle FULL UP; If light remains on Land as soon as possible.

Baggage Fire

Condition: Smoke in baggage compartment. Actions: Power REDUCE; Land as soon as possible; NOTE: Inspect tail boom area for damage.

Fire, Smoke or Fumes in Cabin

Condition: Fire, smoke or heat from a source or location other than electrical equipment (refer to Tab 5 if electrical fire is suspected). Actions: Fire EXTINGUISH; HEATER switch OFF; VENT BLOWER switch ON; Vents and windows OPEN; Land as soon as possible; If additional ventilation is required: Airspeed BELOW $80\,\text{KIAS}$; Passenger/cargo door(s) OPEN.