DOC AIRBUS | AMM A320FEngine Safety Precautions [IAE]
TASK 71-00-00-860-012-A
Engine Safety Precautions
The properties of operation of jet engine powered aircraft make it necessary to prevent:
A. Work Zones and Access Panels
B. Referenced Information
3. Job Set-up
Subtask 71-00-00-869-149-A ** ON A/C NOT FOR ALL
Subtask 71-00-00-860-055-C ** ON A/C NOT FOR ALL
1 Full octave sound pressure levels are given in the figure.
(b) The Air Intake and the Fan Discharge Velocity
a The engine can make enough suction at the inlet duct to pull a person up to, or in to (in part or fully) the duct. This can cause a very bad injury or kill a person.
2 The fan discharge velocity
a When the thrust reverser operates, the fan air comes out forward. The velocity of the discharge air is sufficiently high to cause a bad injury.
(c) The Exhaust
a The jet wake diagrams show danger areas.
b The jet wake diagrams are at standard sea level static conditions.
2 The exhaust heat
a At some time, when the engine is started, fuel which has not been burned in the combustion chamber can ignite in the exhaust area. This can cause long flames to blow out of the exhaust nozzle. all persons must keep away from the exhaust when the engine is started. Remove all flammable material from the area.
b The exhaust is hot when the engine operates at idle. Do not go in the path of the exhaust. The skin can get burned.
3 The exhaust velocity
a Eye protection must be worn while the engine operates. The fan discharge air can collect and blow loose dirt, stones, sand, and other unwanted material a large distance.
(d) The Engine Ignition System High Voltage
1 Do not touch any part of the engine ignition system while the engine operates. The engine ignition system uses high energy which is dangerous and can make electric shocks which can cause a bad injury or kill a person.
(e) Hot Engine Parts
1 Be careful when you work on the engine components immediately after the engine is shutdown. The engine components can stay hot for up to one hour.
2 After engine operation, do not work or make an inspection on the hot section or the exhaust areas for one-half hour (preferably longer).
(f) The Compressor Bleed Valve Discharge
1 Stay away from the bleed valve during the valve-open operation while the engine is in operation. When the bleed valve opens, high pressure air at a high velocity comes out. This air can move a person from his feet and cause injury.
(g) Fuel and Oil
1 Fuels and oils can cause the skin to dry out. If possible do not let fuels or oils touch the skin.
(h) Pressurized Oil System
1 Hot oil can spray on a person and can cause burns.
2 The oil tank is pressurized during operation. The pressure slowly decreases after shutdown. Do not remove the oil tank cap for a minimum of five minutes after engine shutdown.
1 Unless otherwise directly specified, stay outside of the plane of the starter motor during starter motor operation.
(2) Precautions and Procedures for Safe and Correct Engine Operation
1 Clean the area in front of the air intake before the engine is operated.
(b) The exhaust
2 The jet wake diagrams are at standard sea level static conditions.
(c) Deicing Fluid
1 Do not apply deicing fluid with a spray gun in to the engine while the engine is in operation. The deicing fluid will cause contamination of the airfoils and deterioration of performance will be the result.
(d) X-rays
1 The Electronic Engine Control (EEC) can be damaged by continued use of x-rays. The EEC must be removed before the use of x-rays.
(e) Thrust Lever Movement
2 Snap accelerations and decelerations will not cause a deterioration of the engine performance if you obey the instructions which follow:
a Before a snap acceleration, operate the engine at IDLE for at least five minutes after the first engine start.
b After a fast deceleration, operate the engine at IDLE for at least five minutes before an engine shutdown.
c If you operated the engine at high power (higher than 1.33 EPR) for more than 30 seconds (which includes the usual acceleration time), and then operated the engine at IDLE for more than one minute, you must operate the engine at IDLE for at least ten minutes before you make a snap acceleration.
(f) Wind Direction
1 Wind direction and velocity affects the stability of the engine. Where possible, the engine must be operated with the intake in to the wind.
(g) Tailpipe Fires During Engine Start
1 If a tailpipe fire occurs during engine start, shut off the fuel and motor the engine to blow out the fire and decrease the internal engine temperature.
2 In the event of a tail pipe fire of up to 5 seconds duration, there is no need for a special inspection of the CNA or other engine components.
3 In the event of a tail pipe fire of 5 seconds duration or longer, on start-up, or during shutdown, a visual inspection of the CNA and surrounding engine components should be carried out (Ref. AMM TASK 78-10-00-200-012).
4 Do a general visual inspection of the surrounding aircraft structure (pylon, wing lower skin, flap, flap track fairing) for signs of damage.
(h) Dry Chemical Fire Extinguishing Agents
2 Water is not recommended to remove dry chemical fire extinguishing agents. These agents are not water-soluble. Water can cause the agents to build-up and bond to the parts, which can increase the possibility of corrosion.
(i) Aircraft thrust balance during engine operation
1 Single engine operation is allowed up to 1.25 EPR.
2 If higher power is necessary, the thrust of the second engine (non tested engine or opposite engine) must be equal to 1.08 EPR.
Subtask 71-00-00-865-095-A ** ON A/C NOT FOR ALL
[Rev.10 from 2021]
2026.04.01 12:37:17 UTC
Engine Safety Precautions
ZONE: 400
1. Reason for the JobThe properties of operation of jet engine powered aircraft make it necessary to prevent:
- Injury to the persons who operate the engine.
- Damage to the engine.
A. Work Zones and Access Panels
| ZONE/ACCESS | ZONE DESCRIPTION |
|---|---|
| 400 | POWER PLANT, NACELLES AND PYLONS |
| REFERENCE | DESIGNATION |
|---|---|
| TASK 71-00-00-860-014-A | Procedure After the Use of Fire Extinguishing Agents |
| TASK 78-10-00-200-012-A | Visually Examine the Mixed Exhaust System |
Engine Noise LevelsSubtask 71-00-00-869-149-A ** ON A/C NOT FOR ALL
A. Not Applicable
4. ProcedureSubtask 71-00-00-860-055-C ** ON A/C NOT FOR ALL
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.
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. Engine safety precautions NOTE: Idle runs are allowed on asphalt provided it is in good conditions.
(1) Engine safety precautions for the persons who operate the engine WARNING:
EAR PROTECTION MUST BE WORN BY ALL PERSONS WHO WORK NEAR THE ENGINE WHILE THE ENGINE OPERATES. LOUD NOISE FROM THE ENGINE CAN CAUSE TEMPORARY OR PERMANENT DAMAGE TO THE EARS.
(a) Engine noise 1 Full octave sound pressure levels are given in the figure.
(b) The Air Intake and the Fan Discharge Velocity
WARNING:
STAY AWAY FROM THE DANGER AREAS AT THE FRONT AND THE SIDES OF THE ENGINE DURING OPERATION.
1 The air intake a The engine can make enough suction at the inlet duct to pull a person up to, or in to (in part or fully) the duct. This can cause a very bad injury or kill a person.
2 The fan discharge velocity
a When the thrust reverser operates, the fan air comes out forward. The velocity of the discharge air is sufficiently high to cause a bad injury.
(c) The Exhaust
WARNING:
KEEP AWAY FROM THE EXHAUST AREA WHEN THE ENGINE IS STARTED AND WHILE THE ENGINE OPERATES. THE EXHAUST GASES HAVE A BAD SMELL AND CAN BE BAD TO BREATHE. THE GAS IS BAD FOR THE EYES. DO NOT BREATHE THE GAS OR LET THE GAS GET IN YOUR EYES (IN AREAS WHERE THERE IS A HIGH CONCENTRATION).
1 General a The jet wake diagrams show danger areas.
b The jet wake diagrams are at standard sea level static conditions.
2 The exhaust heat
a At some time, when the engine is started, fuel which has not been burned in the combustion chamber can ignite in the exhaust area. This can cause long flames to blow out of the exhaust nozzle. all persons must keep away from the exhaust when the engine is started. Remove all flammable material from the area.
b The exhaust is hot when the engine operates at idle. Do not go in the path of the exhaust. The skin can get burned.
3 The exhaust velocity
a Eye protection must be worn while the engine operates. The fan discharge air can collect and blow loose dirt, stones, sand, and other unwanted material a large distance.
(d) The Engine Ignition System High Voltage
1 Do not touch any part of the engine ignition system while the engine operates. The engine ignition system uses high energy which is dangerous and can make electric shocks which can cause a bad injury or kill a person.
(e) Hot Engine Parts
1 Be careful when you work on the engine components immediately after the engine is shutdown. The engine components can stay hot for up to one hour.
2 After engine operation, do not work or make an inspection on the hot section or the exhaust areas for one-half hour (preferably longer).
(f) The Compressor Bleed Valve Discharge
1 Stay away from the bleed valve during the valve-open operation while the engine is in operation. When the bleed valve opens, high pressure air at a high velocity comes out. This air can move a person from his feet and cause injury.
(g) Fuel and Oil
1 Fuels and oils can cause the skin to dry out. If possible do not let fuels or oils touch the skin.
(h) Pressurized Oil System
1 Hot oil can spray on a person and can cause burns.
2 The oil tank is pressurized during operation. The pressure slowly decreases after shutdown. Do not remove the oil tank cap for a minimum of five minutes after engine shutdown.
WARNING:
STAY AWAY FROM THE KEEP OUT ZONE OF THE STARTER MOTOR DURING STARTER MOTOR OPERATION. IT IS POSSIBLE THAT LOW ENERGY PARTS CAN BE RELEASED DURING STARTER OPERATION. THIS CAN CAUSE INJURY TO PERSONNEL AND/OR DAMAGE TO EQUIPMENT.
(i) Starter motor. 1 Unless otherwise directly specified, stay outside of the plane of the starter motor during starter motor operation.
(2) Precautions and Procedures for Safe and Correct Engine Operation
CAUTION:
DURING GROUND RUNNING, CONCERN FOR FAN BLADE INTEGRITY PROHIBITS STABILISED ENGINE OPERATION IN THE FOLLOWING SPEED RANGE:
- FOR PRE-SCN17/V A/C: DO NOT STABILISE THE ENGINE BETWEEN 61% TO 74% N1 SPEED RANGE
- FOR POST-SCN17/V A/C: STABILISED OPERATION OF THE ENGINE BETWEEN APPROXIMATELY 60% TO 74% N1 SPEED RANGE (LIMITS ARE A FUNCTION OF OUTSIDE TEMPERATURE) WILL BE PROHIBITED BY THE EEC, AS THE SOFTWARE INCLUDES THE KEEP-OUT-ZONE FOR ON-GROUND, STATIC OPERATION.
CAUTION:
BEFORE THE ENGINE IS OPERATED, DO A CHECK OF THE AIR INTAKE, AND THE AREA NEAR IT. EXAMINE FOR LOOSE OBJECTS WHICH COULD BE PULLED IN TO THE ENGINE.
(a) The Air Intake 1 Clean the area in front of the air intake before the engine is operated.
(b) The exhaust
CAUTION:
THE ENGINE EXHAUST TEMPERATURE IS SUFFICIENT TO CAUSE DETERIORATION OF THE ASPHALT PAVEMENT. CONCRETE IS RECOMMENDED FOR THE AREA IN THE EXHAUST PATH.
1 The jet wake diagrams are for reference. 2 The jet wake diagrams are at standard sea level static conditions.
(c) Deicing Fluid
1 Do not apply deicing fluid with a spray gun in to the engine while the engine is in operation. The deicing fluid will cause contamination of the airfoils and deterioration of performance will be the result.
(d) X-rays
1 The Electronic Engine Control (EEC) can be damaged by continued use of x-rays. The EEC must be removed before the use of x-rays.
(e) Thrust Lever Movement
CAUTION:
A DETERIORATION OF THE PERFORMANCE CAN RESULT IF YOU DO NOT OBEY THE INSTRUCTIONS THAT FOLLOW.
1 When possible, all throttle control lever movements must be slow and smooth. 2 Snap accelerations and decelerations will not cause a deterioration of the engine performance if you obey the instructions which follow:
a Before a snap acceleration, operate the engine at IDLE for at least five minutes after the first engine start.
b After a fast deceleration, operate the engine at IDLE for at least five minutes before an engine shutdown.
c If you operated the engine at high power (higher than 1.33 EPR) for more than 30 seconds (which includes the usual acceleration time), and then operated the engine at IDLE for more than one minute, you must operate the engine at IDLE for at least ten minutes before you make a snap acceleration.
(f) Wind Direction
1 Wind direction and velocity affects the stability of the engine. Where possible, the engine must be operated with the intake in to the wind.
(g) Tailpipe Fires During Engine Start
1 If a tailpipe fire occurs during engine start, shut off the fuel and motor the engine to blow out the fire and decrease the internal engine temperature.
2 In the event of a tail pipe fire of up to 5 seconds duration, there is no need for a special inspection of the CNA or other engine components.
3 In the event of a tail pipe fire of 5 seconds duration or longer, on start-up, or during shutdown, a visual inspection of the CNA and surrounding engine components should be carried out (Ref. AMM TASK 78-10-00-200-012).
4 Do a general visual inspection of the surrounding aircraft structure (pylon, wing lower skin, flap, flap track fairing) for signs of damage.
(h) Dry Chemical Fire Extinguishing Agents
CAUTION:
USE OF DRY CHEMICAL FIRE EXTINGUISHING AGENTS CAN CAUSE CORROSION OF THE ENGINE PARTS.
CAUTION:
WATER USED TO REMOVE DRY CHEMICAL FIRE EXTINGUISHING AGENTS CAN INCREASE THE POSSIBILITY OF CORROSION.
1 Dry chemical fire extinguishing agents are not recommended, but if these agents are used, special precautions are necessary to prevent corrosion to the engine parts (Ref. AMM TASK 71-00-00-860-014). 2 Water is not recommended to remove dry chemical fire extinguishing agents. These agents are not water-soluble. Water can cause the agents to build-up and bond to the parts, which can increase the possibility of corrosion.
(i) Aircraft thrust balance during engine operation
1 Single engine operation is allowed up to 1.25 EPR.
2 If higher power is necessary, the thrust of the second engine (non tested engine or opposite engine) must be equal to 1.08 EPR.
B. Make sure that this(these) circuit breaker(s) is(are) closed:
Subtask 71-00-00-860-065-D ** ON A/C NOT FOR ALL | PANEL | DESIGNATION | FIN | LOCATION |
|---|---|---|---|
| ** ON A/C NOT FOR ALL | |||
| 49VU | L/G/LGCIU/SYS1/NORM | 1GA | C09 |
| 121VU | HYDRAULIC/LGCIU/SYS2 | 2GA | Q35 |
| 121VU | HYDRAULIC/LGCIU/SYS1/GRND SPLY | 52GA | Q34 |
C. Prevent aircraft movement during engine operation
(b) Make sure the parking brake is set.
(c) Push and hold the brake pedals to the full limit position.
(d) When the test is completed, return to the parking brake configuration.
1 Move back the two throttle control levers to the idle position.
2 Return to the parking brake configuration.
(e) If, after the engine start, you must operate the engine at high power, use the 98F10103500000 CHOCK-MLG,ENGINE RUN-UP.
1 Put the 98F10103500000 CHOCK-MLG,ENGINE RUN-UP tool in position against the wheel.
2 Pull up the tow bar in the top position until it touches the weld stops.
(f) There must be two approved persons in the cockpit when you do an engine run at more than idle. One must monitor the outside and the aircraft while the other one does the engine test.
(g) If the aircraft starts to move while you do an engine run, immediately set all the thrust levers to the idle position.
CAUTION:
DURING GROUND RUNNING, CONCERN FOR FAN BLADE INTEGRITY PROHIBITS STABILISED ENGINE OPERATION IN THE FOLLOWING SPEED RANGE:
(1) If high power is necessary (more than idle), use wheel chocks and the brake pedals to make sure that the aircraft does not move. Do the procedure that follows: - FOR PRE-SCN17/V A/C: DO NOT STABILISE THE ENGINE BETWEEN 61% TO 74% N1 SPEED RANGE
- FOR POST-SCN17/V A/C: STABILISED OPERATION OF THE ENGINE BETWEEN APPROXIMATELY 60% TO 74% N1 SPEED RANGE (LIMITS ARE A FUNCTION OF OUTSIDE TEMPERATURE) WILL BE PROHIBITED BY THE EEC, AS THE SOFTWARE INCLUDES THE KEEP-OUT-ZONE FOR ON-GROUND, STATIC OPERATION.
CAUTION:
DO NOT OPEN LGCIU CIRCUIT BREAKERS 1GA, 2GA AND 52GA. IF YOU DO THIS, AIRCRAFT BRAKING THROUGH BRAKE PEDALS DOES NOT OPERATE.
(a) On the LANDING GEAR CTL & IND panel 402VU, set the "A/SKID NOSE WHEEL" switch to the ON position. (b) Make sure the parking brake is set.
(c) Push and hold the brake pedals to the full limit position.
(d) When the test is completed, return to the parking brake configuration.
1 Move back the two throttle control levers to the idle position.
2 Return to the parking brake configuration.
(e) If, after the engine start, you must operate the engine at high power, use the 98F10103500000 CHOCK-MLG,ENGINE RUN-UP.
1 Put the 98F10103500000 CHOCK-MLG,ENGINE RUN-UP tool in position against the wheel.
2 Pull up the tow bar in the top position until it touches the weld stops.
(f) There must be two approved persons in the cockpit when you do an engine run at more than idle. One must monitor the outside and the aircraft while the other one does the engine test.
(g) If the aircraft starts to move while you do an engine run, immediately set all the thrust levers to the idle position.