DOC AIRBUS | AMM A320FSafety Precautions During Engine Ground Operations [CFMI]
TASK 71-00-00-869-006-A
Safety Precautions During Engine Ground Operations
Self explanatory
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment
B. Work Zones and Access Panels
C. Referenced Information
3. Job Set-up
Subtask 71-00-00-869-055-A ** ON A/C NOT FOR ALL
Subtask 71-00-00-869-052-A ** ON A/C NOT FOR ALL
[Rev.10 from 2021]
2026.04.01 02:21:21 UTC
Safety Precautions During Engine Ground Operations
ZONE: 400
1. Reason for the JobSelf explanatory
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment
| REFERENCE | QTY | DESIGNATION |
|---|---|---|
| 98F10103500000 | 2 | CHOCK-MLG,ENGINE RUN-UP |
| ZONE/ACCESS | ZONE DESCRIPTION |
|---|---|
| 400 | POWER PLANT, NACELLES AND PYLONS |
| REFERENCE | DESIGNATION |
|---|---|
Engine Physical Hazard Areas - Minimum IdleSubtask 71-00-00-869-055-A ** ON A/C NOT FOR ALL
A. Not Applicable
4. ProcedureSubtask 71-00-00-869-052-A ** ON A/C NOT FOR ALL
A. Safety Precautions during Engine Ground Operation
(1) General
(a) The operation of jet power plants is dangerous. While the engine operates, the following dangerous conditions can occur:
1 There is a very strong suction at the front of the engine that can pull persons and unwanted materials into the air inlet.
2 Very hot, high speed gases go rearward from the turbine exhaust nozzle.
3 The fan exhaust at high thrust has very high speed.
4 When the thrust reverser is extended, the fan exhaust goes forward while the turbine exhaust goes rearward.
5 Exposure to engine noise can damage your hearing.
(2) Obey the following precautions about the air inlet
(a) Persons positioned near the power plant during power plant operation must be aware of the hazard areas aft of the inlet cowl lip.
1 This area extends completely around the outer diameter and to the forward end of the power plant.
2 If the surface wind is more than 25 knots, increase the distance of the hazard area by 20 percent.
3 If the ramp surfaces are wet or frozen, make the ramp clean to prevent injuries to persons.
4 After the engine is shutdown, let the engine spool down before the air inlet is approached.
(b) Make sure that persons that do not know of the hazard areas near the power plant cannot go in these areas.
2 The air which is near the inlet moves at a much higher velocity than the air which is farther from the inlet.
3 The quantity of the engine suction does not increase slowly and continuously when you go near the inlet.
4 The suction is small until you get near the inlet, where the suction increases suddenly.
5 The engine suction can pull small objects into the engine more easily than it can pull large objects.
(c) Before you operate the engine, do these steps:
2 Make sure that the area 40 ft. (12 m) to each side and forward of the engine is clean.
3 Make sure that the ground which is forward of the engine is strong and solid.
4 Make sure that the suction of the engine will not pull the unwanted material on the ground into the engine.
5 Make sure that persons with loose objects (such as hats, eyeglasses, loose clothing or rags) do not go into this area.
(d) Stay outside of the inlet hazard area for at least 30 seconds after the fuel cutoff signal from the flight compartment.
(3) Obey the following precautions about the engine exhaust
1 The exhaust is hot and moves at high speed.
2 There are contamination and bad gases which were pulled into the engine by suction.
3 There are gases from the fuel that has burned or fuel which has not burned.
(b) At high power, the fan and turbine exhaust can blow loose dirt, stones, sand and other unwanted materials a distance of 300 ft. (91 m).
1 The airplane must be parked in an area where injury to persons or damage to equipment or other airplanes can be prevented.
2 Use a blast fence to deflect the thrust if the engines are operated without sufficient space to decrease the fan and turbine exhaust thrust to zero.
(c) High temperature exhaust can be found 300 ft. (91 m) from the exhaust nozzle with the correct wind conditions.
(d) When an engine is started, fuel that has collected in the turbine exhaust sleeve can ignite.
1 Long flames are blown out of the exhaust nozzle.
2 All flammable materials must be kept clear of the exhaust nozzle.
(e) There are gases in the exhaust that are dangerous to you. You must stay away from small spaces where these gases can collect. Tests have shown that the amount of carbon monoxide in the exhaust is small, but there are other gases in the exhaust that smell bad and can cause injury or irritation to your eyes and lungs.
1 These gases will usually cause a watering or burning sensation to your eyes.
2 Less noticeable, but important, is the possibility of respiratory irritation.
(5) Obey the following precautions about engine cool down.
(b) The other parts of the engine can with no danger of burns.
(6) Obey the following precautions about engine noise
(a) You can temporarily cause your ears to become less sensitive to sound if you listen to loud engine noise.
(b) You can become permanently deaf if you listen to the engine noise for a long time.
(c) When you are near an operating engine, always use ear protection to decrease the quantity of sound energy which reaches your ears.
(b) Make sure that the engine 1(2) shutdown occurred a minimum of five minutes before you proceed.
(8) Obey the following precautions about the engine fuel and lubrication oils.
(a) All the fuels, lubrication oils and hydraulic fluids will make your skin dry. Do not let these fluids touch your skin.
(9) Obey the following precautions about the cowl doors.
(10) Change core or fan speed from percentage to actual RPM.
(a) Use the chart given in the figure to change core or fan speed from percentage to actual RPM.
(11) Prevent aircraft movement during engine operation.
(12) If the engine start is followed by a high power run, use the 98F10103500000 CHOCK-MLG,ENGINE RUN-UP.
(a) There must be two qualified persons in the cockpit when performing an engine run above idle. One must monitor the outside and the aircraft behavior while the other performs the engine test.
(b) If the aircraft begins to move while performing an engine run, immediately set all the thrust levers the to idle position.
(1) General
(a) The operation of jet power plants is dangerous. While the engine operates, the following dangerous conditions can occur:
1 There is a very strong suction at the front of the engine that can pull persons and unwanted materials into the air inlet.
2 Very hot, high speed gases go rearward from the turbine exhaust nozzle.
3 The fan exhaust at high thrust has very high speed.
4 When the thrust reverser is extended, the fan exhaust goes forward while the turbine exhaust goes rearward.
5 Exposure to engine noise can damage your hearing.
(2) Obey the following precautions about the air inlet
(a) Persons positioned near the power plant during power plant operation must be aware of the hazard areas aft of the inlet cowl lip.
1 This area extends completely around the outer diameter and to the forward end of the power plant.
2 If the surface wind is more than 25 knots, increase the distance of the hazard area by 20 percent.
3 If the ramp surfaces are wet or frozen, make the ramp clean to prevent injuries to persons.
4 After the engine is shutdown, let the engine spool down before the air inlet is approached.
(b) Make sure that persons that do not know of the hazard areas near the power plant cannot go in these areas.
WARNING:
ALL PERSONS MUST STAY OUT OF THE DANGEROUS AREAS AROUND THE AIR INLET. ALL PERSONS MUST STAY AWAY FROM THE ENGINE SAFETY BARRIER WHEN THE ENGINE IS OPERATED. DURING ENGINE OPERATION, THERE IS SUFFICIENT SUCTION AT THE AIR INLET TO PULL A PERSON INTO THE INLET. A FATAL INJURY COULD OCCUR.
WARNING:
MAKE SURE THAT WHEN THE ENGINES OPERATE ON THE GROUND:
- NO PERSONS GO WHERE THE AIRCRAFT CAN CAUSE THEM INJURY OR CAN KILL THEM
- NO OBJECTS STAY WHERE THE ENGINES CAN BLOW THEM AWAY OR WHERE THEY CAN BE PULLED INTO THE ENGINES BY SUCTION.
WARNING:
IF TWO ENGINES ARE IN OPERATION AT THE SAME TIME, MAKE SURE THAT NO MAINTENANCE PERSONNEL STAY IN THE AREA BETWEEN THE TWO ENGINES.
1 When the engine operates, it makes a low air pressure area in the inlet. This low pressure area causes a large quantity of air to move from the forward side of the inlet cowl and go into the engine. 2 The air which is near the inlet moves at a much higher velocity than the air which is farther from the inlet.
3 The quantity of the engine suction does not increase slowly and continuously when you go near the inlet.
4 The suction is small until you get near the inlet, where the suction increases suddenly.
5 The engine suction can pull small objects into the engine more easily than it can pull large objects.
(c) Before you operate the engine, do these steps:
WARNING:
MAKE SURE THAT:
- THE PASSENGER DOORS ARE CLOSED AND THE PASSENGER LOADING STAIRS ARE REMOVED WHEN AT LEAST ONE ENGINE IS OPERATED ABOVE IDLE POWER.
- THE CARGO DOORS ARE CLOSED AND CARGO LOADING EQUIPMENT IS REMOVED WHEN:
WARNING:
MAKE SURE THAT THE LANDING GEAR GROUND SAFETIES AND THE WHEEL CHOCKS ARE IN POSITION. MOVEMENT OF THE AIRCRAFT CAN BE DANGEROUS.
CAUTION:
- SEE THE APPLICABLE FIGURE FOR WIND LIMIT RESTRICTIONS WHEN THE ENGINE OPERATES.
1 Make sure that there are no tools, unwanted materials or objects in the air inlet. - NATURAL WINDS AND IRREGULAR FORCES FROM SUDDEN GUSTS INCREASE THE DANGEROUS AREA.
- DO NOT GO ABOVE OPEN COWLING LIMITATIONS WHEN YOU DO THE TESTS.
- THE OPERATOR MUST FULLY KNOW ALL THE OPERATING LIMITS AND PROCEDURES BEFORE THE ENGINE OPERATES.
2 Make sure that the area 40 ft. (12 m) to each side and forward of the engine is clean.
3 Make sure that the ground which is forward of the engine is strong and solid.
4 Make sure that the suction of the engine will not pull the unwanted material on the ground into the engine.
5 Make sure that persons with loose objects (such as hats, eyeglasses, loose clothing or rags) do not go into this area.
(d) Stay outside of the inlet hazard area for at least 30 seconds after the fuel cutoff signal from the flight compartment.
(3) Obey the following precautions about the engine exhaust
WARNING:
ALL PERSONS MUST STAY OUT OF THE DANGEROUS AREAS THAT ARE AFTER OF THE POWER PLANT. DURING THE ENGINE OPERATION, THERE ARE HOT GASES AND HIGH SPEED AIR WHICH CAN CAUSE INJURY TO PERSONS AND DAMAGE TO EQUIPMENT.
CAUTION:
MAKE SURE THAT THE AIRCRAFT IS PARKED ON A CLEAN, DRY AND FLAT SURFACE. THERE MUST BE NO OIL, GREASE OR SIMILAR MATERIALS ON THE SURFACE.
THE PAVEMENT MUST NOT BE BROKEN OR LOOSE, AND WE RECOMMEND CONCRETE MATERIAL BECAUSE ASPHALT CAN MELT AND CAUSE DAMAGE TO THE AIRCRAFT.
(a) When the engine operates, a large quantity of exhaust comes from the aft end of the engine. 1 The exhaust is hot and moves at high speed.
2 There are contamination and bad gases which were pulled into the engine by suction.
3 There are gases from the fuel that has burned or fuel which has not burned.
(b) At high power, the fan and turbine exhaust can blow loose dirt, stones, sand and other unwanted materials a distance of 300 ft. (91 m).
1 The airplane must be parked in an area where injury to persons or damage to equipment or other airplanes can be prevented.
2 Use a blast fence to deflect the thrust if the engines are operated without sufficient space to decrease the fan and turbine exhaust thrust to zero.
(c) High temperature exhaust can be found 300 ft. (91 m) from the exhaust nozzle with the correct wind conditions.
(d) When an engine is started, fuel that has collected in the turbine exhaust sleeve can ignite.
1 Long flames are blown out of the exhaust nozzle.
2 All flammable materials must be kept clear of the exhaust nozzle.
(e) There are gases in the exhaust that are dangerous to you. You must stay away from small spaces where these gases can collect. Tests have shown that the amount of carbon monoxide in the exhaust is small, but there are other gases in the exhaust that smell bad and can cause injury or irritation to your eyes and lungs.
1 These gases will usually cause a watering or burning sensation to your eyes.
2 Less noticeable, but important, is the possibility of respiratory irritation.
WARNING:
- ENGINE OPERATION MUST NOT EXCEED MINIMUM IDLE WHEN PERSONNEL ARE IN ENTRY/EXIT CORRIDOR.
(4) Obey the following precautions about the entry corridor - POSITIVE COMMUNICATION BETWEEN THE FLIGHT COMPARTMENT AND PERSONNEL IN ENTRY EXIT CORRIDOR IS NECESSARY.
- INLET AND EXHAUST HAZARD AREAS MUST BE STRICTLY OBSERVED BY PERSONNEL IN ENTRY/EXIT CORRIDOR.
- POSITIVE COMMUNICATION BETWEEN FLIGHT COMPARTMENT AND PERSONNEL IN ENTRY/EXIT CORRIDOR IS NECESSARY.
- INLET AND EXHAUST HAZARD AREAS MUST BE STRICTLY OBSERVED BY PERSONNEL IN ENTRY/EXIT CORRIDOR.
(5) Obey the following precautions about engine cool down.
WARNING:
DO NOT TRY TO STOP THE FAN FROM TURNING BY HAND. THIS CAN CAUSE INJURY TO THE PERSONS AND DAMAGE TO THE EQUIPMENT.
(a) After engine operation, make sure that the turbine exhaust sleeve and plug become sufficiently cool before maintenance is done in these areas. (b) The other parts of the engine can with no danger of burns.
(6) Obey the following precautions about engine noise
(a) You can temporarily cause your ears to become less sensitive to sound if you listen to loud engine noise.
(b) You can become permanently deaf if you listen to the engine noise for a long time.
(c) When you are near an operating engine, always use ear protection to decrease the quantity of sound energy which reaches your ears.
NOTE: The use of cup-type ear protection is recommended.
(7) Obey the following precautions about the engine ignition system. WARNING:
THE ENGINE IGNITION SYSTEM IS AN ELECTRICAL SYSTEM WITH HIGH ENERGY. YOU MUST BE CAREFUL TO PREVENT ELECTRICAL SHOCK. INJURY OR DEATH CAN OCCUR TO YOU. DO NOT DO MAINTENANCE ON THE IGNITION SYSTEM WHEN YOU OPERATE THE ENGINE.
(a) Open the circuit breakers for the ignition system to deactivate the ignition system. (b) Make sure that the engine 1(2) shutdown occurred a minimum of five minutes before you proceed.
(8) Obey the following precautions about the engine fuel and lubrication oils.
(a) All the fuels, lubrication oils and hydraulic fluids will make your skin dry. Do not let these fluids touch your skin.
(9) Obey the following precautions about the cowl doors.
WARNING:
DO NOT DO AN ENGINE RUN-UP WITH THE THRUST REVERSER COWLS OPEN. IF YOU OPERATE THE ENGINE AT MORE THAN IDLE, THE FAN COWLS MUST NOT BE OPEN. IF YOU DO NOT OBEY THESE INSTRUCTIONS, INJURY TO PERSONS AND/OR DAMAGE TO EQUIPMENT CAN OCCUR.
WARNING:
DO NOT STAND BETWEEN THE COWL DOORS AND THE ENGINE WHEN YOU OPEN OR CLOSE THE DOORS OR INJURIES CAN OCCUR IF THE DOORS CLOSE SUDDENLY.
(a) Make sure that the cowl door hold-open rods are extended and attached to the engine if the cowl doors are opened for maintenance actions when the engine is run. (10) Change core or fan speed from percentage to actual RPM.
(a) Use the chart given in the figure to change core or fan speed from percentage to actual RPM.
(11) Prevent aircraft movement during engine operation.
(12) If the engine start is followed by a high power run, use the 98F10103500000 CHOCK-MLG,ENGINE RUN-UP.
(a) There must be two qualified persons in the cockpit when performing an engine run above idle. One must monitor the outside and the aircraft behavior while the other performs the engine test.
(b) If the aircraft begins to move while performing an engine run, immediately set all the thrust levers the to idle position.