TH-73A EPs CMIs -- in NATOPs Order (15FEB26 NATOPS)

Engine Failure - Hover IGE

1. Collective — Maintain initially then increase to cushion T/D

2. pedals — control yaw rate

3. cyclic — adjust to obtain skid level attiude

Engine Failure - Takeoff

1. Collective — lower immediately to stop NR decay

2. pedals — control yaw rate

3. autorotative landing — complete

Engine Failure - Hover OGE

1. collective — lower immediately to stop NR decay

2. pedals — control yaw rate

3. cyclic — fwd to increase airspeed

4. autorotative landing — complete

Engine Failure - Cruise

1. collective — lower immediately to stop NR decay

2. pedals — control yaw rate

3. cyclic — adj to desired A/s

If time and altitude permit:

4. MAYDAY — Transmit

5. Transponder — 7700

6. Engine Restart in Flight — as req.

If the engine remains off/failed:

7. Autorotative Landing — complete

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CAUTION

• Keep rotor speed between 90-100% NR

NOTES

• an engine failure does not disengage the flight director. If the flight director had been engaged, consideration should be given to pressing the FD STBY button to prevent the autopilot from repositioning the cyclic as the A/c tries to maintain FD parameters.

• min rate of descent = approx. 60 KIAS + 90% NR

• max glide = approx. 95 KIAS + 90% NR

• min glide = approx. 60 KIAS + 100% NR

Engine Restart in Flight

1. GEN switch — OFF

2. Twist grip — OFF

3. START pushbutton — press and release

When N1 reaches 10-20%:

4. Twist grip — IDLE

When starter drops out and N1 61 ± 1%:

5. Twist grip — FLT

6. GEN switch — ON

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CAUTION

• when the cause of an engine failure is due to a mechanical isse, do not attempt a restart

Autorotative Landing

@ approx. 150’:
1. Cyclic — flare to reduce fwd speed

@ approx. 20-30’:

2. collective — raise to reduce ROD

3. cyclic — fwd to obtain skid level attitude

4. collective — continue application to cushion T/D

5. pedals — maintain direction

6. Emergency shutdown — Complete

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CAUTION

• in case of contact on the aft portion of the landing skid, avoid counteracting the pitch down with cyclic

Engine Oil Pressure Low

Engine oil pressure below 40 psi or 40-80 psi and decreasing:

1. Reduce power

2. monitor engine parameters

3. LASAPo

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NOTE

• engine oil pressure may enter the cautionary range during practice autorotations.

Engine Oil Temperature High

1. Reduce power

2. monitor engine params

3. LASAPo

Abort Start

1. Twist Grip — OFF

2. IGN switch — OFF

3. STARTER pushbutton — continue to operate until ITT decreases to normal range

4. Fuel panel switches — OFF/CLOSED

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CAUTION

• Failure to utilize a GPU/battery cart on subsequent start attempts may result in a hot start.

Engine Compressor Stall

1. collective — lower to clear stall

2. Airspeed — 60-70 KIAS level flight

3. LASAPo

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WARNING

• this emergency may result in an engine failure

NOTES

• if some usable power exists but level flight cannot be maintained, that power may be utilized to effect a landing or minimize rate of descent enroute to a suitable landing site for autorotation.

• Pilots may consider using continuous function of the ignition switch until landing is assured

Malfunction of the Fuel Control System (Overspeed)

If the fuel control system malfunction causes an increase in power (overspeed):

1. Twist grip — reduce until NR/N2 are in normal range

2. Collective/TG — coordinate

3. LASAPo

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WARNING

• N1 decreasing below 51% will cause engine flame out.

NOTES

• An overspeed may result in an EEC Failure

• Pilots may consider using the continuous function of the ignition switch until landing is assured.

Malfunction of the Fuel Control System (Underspeed)

If the fuel control system malfunction causes an decrease in power (underspeed):

1. Collective — Lower to maintain NR

2. MAN/NOR switch — MAN

3. Twist grip — slowly rotate towards MAX

4. Collective/TG — coordinate

5. LASAPo

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WARNING

• Rapid movement of the throttle in MAN may result in engine over temp, over torque, overspeed, or engine surge

• N1 decreasing below 51% will cause engine flame out

NOTES

• Pilots may consider using the continuous function of the ignition switch until landing is assured.

Engine RGB Chip

1. Reduce power

2. check for 2ndry indications

If 2ndry indications exist:

3. LASAPo

The use of CHIP BURNER switch when the relative oil pressure is below limits is prohibited

If no 2ndry indications:

4. CHIP BURNER — Activate and release

If msg does not extinguish or on 4th ENG RGB CHIP msg:

5. LASAPo

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NOTES

• The CHIP BURNER switch shall not be used to suppress a chip caution light when A/c is on the ground

• the CHIP BURNER can be activated 3x per flight

Engine AGB Chip

1. Reduce power

2. LASAPo

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NOTES

• CHIP BURNER is not available w/ an ENG AGB CHIP

Inadvertent Engine Shutdown/Rapid Rise in ITT on Deck

1. Twist grip — OFF

2. IGN Switch — OFF

3. GEN switch — OFF

4. STARTER pushbutton — press and hold until ITT decreases to normal range

5. Fuel panel switches — OFF/CLOSED

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CAUTION

• attempting to immediately restart an engine or returning the TG to IDLE, after an inadvertent S/D may result in engine damage

Transmission Malfunction

If failure is imminent:

1. Land Immediately

If failure is not imminent:

2. Reduce power

3. monitor transmission params

4. LASAPo

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WARNING

• possible indications of imminent transmission failure may include:

  • yaw attitude excursions w/ no control input

  • an increase in power required for a fixed collective setting

  • increased noise

  • increased vibrations

  • or, abnormal fumes

NOTE

• Transiting at a min power required A/s and low altitude may permit a quick flare and immediate landing in the event of an imminent transmission failure

Transmission Chip

If XSMN CHIP msg is illuminated:

1. Check for 2ndry indications

If 2ndry indications exist:

2. Transmission Malfunction EP — Perform

The use of CHIP BURNER switch when relative oil pressure is below limits is prohibited

If no 2ndry indications:

3. CHIP BURNER switch — activate and release

If the msg does not extinguish oron 4th XSMN CHIP msg:

4. TRansmission Malfunction EP — Perform

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NOTES

• The CHIP BURNER switch shall not be used to suppress a chip caution light when A/c is on the ground

• the CHIP BURNER can be activated 3x per flight

• Flickering or intermittent CHIP indications should be considered a singular chip event

Loss of Tail Rotor Thrust in a Hover

1. Twist grip — IDLE

2. cyclic — eliminate drift

3. collective — increase to cushion the landing

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CAUTION

• a slight rotation to the right can be expected on T/D

Loss of Tail Rotor Thrust in Cruise Flight

1. Collective — Lower to eliminate yaw

2. A/s — adj to reach suitable landing site

On reaching the point of intended landing:

3. autorotate

4. Twist grip — OFF prior to T/D

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NOTE

• an increase in power necessitates an increase in speed to prevent the helicopter from excessive yaw

Tail Rotor Chip

1. Reduce POwer

2. CHIP BURNER switch — activate and release

If the msg does not extingush oron 4th TR BOX CHIP msg:

3. LASAPo

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WARNING

• Be prepared for complete loss of tail rotor thrust

• High power settings may result in tail rotor gearbox failure

NOTES

• The CHIP BURNER switch shall not be used to suppress a chip caution light when A/c is on the ground

• the CHIP BURNER can be activated 3x per flight

• Flickering or intermittent CHIP indications should be considered a singular chip event

Hydraulic System No. 1 or No. 2 Pressure Loss

1. Establish VMC

2. Avoid rapid mvmt of flight controls

3. A/s — reduce smoothly below 90 KIAS

4. Affected SERVO switch — OFF

5. LASAPo

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CAUTION

• pull-up maneuvers and bank angles beyond 25 degrees may result in excessive flight control loads

NOTES

• Tail rotor pedals are not boosted when the hydraulic system No. 1 fails

• Rapid power changes w/ 1 SERVO off can result in an excessive yaw that may not be controlled w/ unboosted pedals

• Unboosted pedals may be insufficient to counteract right yaw w. strong right crosswinds

Fuel Pump 1 and/or Fuel Pump 2 Failure

If both pumps ail w/ 0 psi:

1. LASAPo

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NOTES

• Pilots may consider using the continuous function of the ignition switch until landing is assured

• Any flight time w/ both fuel pumps OFF or failed must be reported to maintenance. Ground operations w/ both fuel pumps OFF or failed need not be restricted.

Engine Fire in Flight

1. Confirm fire

If fire confirmed:

2. Land immediately

If fire note confirmed:

3. LASAPo

When on deck:

4. emergency shutdown — complete

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WARNING

• this emergency may result in engine failure

Cockpit/Cabin Fire in Flight

1. Air conditioning/vent/heater switches — OFF

2. vent knob — push

3. A/s — adj, as required

4. doors/windows — close

If electrical source suspected:

5. unnecessary electrical equipment — secure

6. Fire extinguishers — As required

If fire persist:

7. Land immediately

If fire extinguishes:

8. LASAPo

When on deck:

9. Emergency shutdown — complete

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CAUTION

• If the fire is not completely extinguished, increasing ventilation may aggravate the problem

Smoke/Fume Elimination

1. VENT CKPT switch — On

2. Vent knob — pull

3. A/s — adj, as required

4. doors/windows — open

If smoke/fume persist:

5. slip or skid to eliminate smoke and fumes

6. land immediately

7. Emergency shutdown — complete

If smoke/fumes extinguish:

8. LASAPo

Emergency Shutdown

1. Twist grip — OFF

2. fuel panel switches — OFF/CLOSED

3. rotor brake — ON

4. GEN switch — OFF

5. BAT switch — OFF

When rotor stops:

6. helicopter — egress

Immediate Landing/Ditching

1. Crew and passengers — alert

2. MAYDAY — transmit

3. transponder — 7700

4. doors — open/jettison, as req.

5. landing light / search light — as req.

when on deck:

6. emergency shutdown — complete

If water landing

7. underwater egress— execute

Underwater Egress

1. SEBD - don, as req

2. communication cords — disconenct

3. doors — open/jettison

4. place hand on known reference point

once all violent action has stopped:

5. harness — release

6. exit helicopter

After egress:

7. swim clear and inflate LPU

Lightening Strike

1. A/s — reduce below 80 KIAS

2. maneuver slowly

3. LASAPo

Hoist Load Jettison

1. HOIST CUT pushbutton guard — Lift. Verify HOIST CUT ARMD CAS msg appears

2. HOIST CUT pushbutton — press

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NOTE

• cut cable as close to hoist as possible

Rescue Hoist Failure

1. Cease hoisting

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WARNING

• if for any reason hoist stops during raising or lowering operations, do not attempt to free it by actuating the controller. Continued operation may cause total cable failure.

Hoist Cable Fouled

1. Pay out cable and attempt to free hang up

Runaway Hoist

1. Notify pilot

2. attempt to raise hoist

If payout continues:

3. HOIST OFF/ON control switch — OFF

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NOTE

• If safe landing area available, place personnel/cargo on deck, manually disconnect load, and recover hoist cable hand over hand

Rotor Brake On

In flight:

1. rotor brake lever — verify OFF

2. Land immediately

On the ground:

3. rotor brake lever — verify OFF

4. Emergency shutdown — Complete

Loss of Torque Sensor Power

1. LASAPo