General Warnings and Cautions and Related Safety Data [PW11]

TASK 71-00-00-910-804-A
General Warnings and Cautions and Related Safety Data

WARNING: BE CAREFUL WHEN YOU DO WORK ON THE ENGINE AND THE ADJACENT COMPONENTS AFTER ENGINE SHUTDOWN. THE ENGINE, THE ENGINE OIL AND THE ADJACENT COMPONENTS CAN STAY HOT FOR A LONG TIME. IF YOU DO NOT OBEY THIS INSTRUCTION, INJURY CAN OCCUR.

WARNING: BE CAREFUL WHEN YOU USE CONSUMABLE MATERIALS. OBEY THE MATERIAL MANUFACTURER'S INSTRUCTIONS AND YOUR LOCAL REGULATIONS.

ZONE: 400

1. Reason for the Job
This procedure provides procedures to prepare the aircraft and engine for ground operation and safety precautions for engine operation.
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment

REFERENCE	QTY	DESIGNATION
No specific	1	COVER - PROTECTION
98F10103500000	2	CHOCK-MLG,ENGINE RUN-UP

B. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
400	POWER PLANT, NACELLES AND PYLONS

C. Referenced Information

REFERENCE	DESIGNATION
TASK 70-27-00-910-806-A	SPOP 425 - Requirements after Contact with Fire Extinguishing Agents, Hydraulic Fluid, Fuel or Oil
TASK 79-11-02-000-801-A	Removal of the Oil Tank Cap and Filler Neck
Direct Thrust Air Intake Suction Danger Area
Thrust Reverser Idle Danger Zone
Wind Direction And Velocity Operational Limits
Jet Wake Ground Idle and Takeoff Danger Area Diagram
Tool Installation
Jet Engine Noise Danger Area

3. Job Set-up
Subtask 71-00-00-869-357-A ** ON A/C NOT FOR ALL

A. Not Applicable

4. Procedure
Subtask 71-00-00-910-058-A ** ON A/C NOT FOR ALL

A. Safety Precautions
(1) Danger areas:

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:

. ENGINE 2 IS OPERATED AT IDLE OR ABOVE . AT LEAST ONE ENGINE IS OPERATED ABOVE IDLE POWER IF YOU DO NOT OBEY THESE PRECAUTIONS INJURY TO THE PERSONNEL AND DAMAGE TO THE AIRCRAFT AND/OR EQUIPMENT CAN OCCUR.

CAUTION: BEFORE YOU START THE ENGINE, MAKE SURE THAT THERE ARE NO LOOSE OBJECTS IN THE AIR INTAKE COWL AND IN THE AREA NEAR THE AIR INTAKE. THE SUCTION IS SUFFICIENT AT THE AIR INTAKE COWL TO PULL LOOSE OBJECTS INTO THE ENGINE AND CAUSE MUCH ENGINE DAMAGE.

(a) Make sure that all parts, tools, equipment, covers and loose objects are removed from the engine air intake and the area in front of the air intake before the engine is operated.
(b) Do a visual inspection of the ground in front of and near the engine intake for loose and unwanted material.
(c) Authorized persons near the engine must only go near the engine at idle power and obey the entry corridor areas.

Direct Thrust Air Intake Suction Danger Area ** ON A/C NOT FOR ALL

(d) Do not operate the engine above idle power with persons in the entry corridor areas.
(e) The air intake:

WARNING: STAY AWAY FROM THE DANGER AREAS AT THE FRONT AND THE SIDES OF THE ENGINE DURING OPERATION. THE SUCTION IS SUFFICIENT AT THE AIR INTAKE COWL TO PULL A PERSON INTO (IN PART OR FULLY) THE ENGINE. THIS CAN KILL A PERSON OR CAUSE A BAD INJURY.

1 The air intake is in the front of the engine. There is a strong air suction when the air goes into the engine. The suction is very strong when the engine operates at takeoff power.

CAUTION: REMOVE OR MAKE SAFE ALL LOOSE ITEMS BEFORE YOU DO WORK AROUND AN ENGINE THAT OPERATES. THE SUCTION IS SUFFICIENT AT THE AIR INTAKE COWL TO PULL HATS, LOOSE CLOTHING, GLASSES, AND WORK RAGS FROM YOUR POCKETS INTO THE ENGINE.

2 The air intake danger areas and entry corridor areas are shown on the related figure.

Direct Thrust Air Intake Suction Danger Area ** ON A/C NOT FOR ALL

WARNING: DO NOT APPLY DEICING FLUID WITH A SPRAY GUN INTO 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.

3 You must be careful when using de-icing fluid in areas near the engine air intake. De-icing fluid is sprayed on engine nacelles to remove and prevent ice. Do not spray de-icing fluid into the engine gaspath.
(f) The thrust reverser:

WARNING: WHEN THE REVERSER OPERATES, STAY AWAY FROM THE DANGER AREAS AT THE FRONT AND THE SIDES OF THE ENGINE. THE FAN DISCHARGE AIR COMES OUT THE SIDES OF THE ENGINE AND MOVES TO THE FRONT. THE VELOCITY OF THE FAN DISCHARGE AIR IS SUFFICIENT TO CAUSE YOU TO FALL, OR TO CAUSE YOU A BAD INJURY, OR KILL YOU.

WARNING: WHEN THE REVERSER OPERATES, MAKE SURE THAT ALL PERSONS WHO DO WORK NEAR THE AIRCRAFT USE EYE PROTECTION. THE FAN DISCHARGE AIR CAN COLLECT AND BLOW LOOSE DIRT, STONES, SAND OR OTHER UNWANTED MATERIAL A LONG DISTANCE.

1 Do not operate the engine thrust reverser with persons in the entry corridor areas.
2 The thrust reverser is usually used after the aircraft lands. It is possible (not recommended) to operate the thrust reverser at idle power when the aircraft is parked. When the thrust reverser operates, the fan discharge air blows out the sides of the engine towards the front of the aircraft.

NOTE: Thrust reverser engine operation is not recommended when the aircraft is parked (stopped). The thrust reverser air can go into the engine again with unwanted objects (from the ground) and cause gaspath damage and a stall.

(g) Engine exhaust areas:

WARNING: STAY AWAY FROM THE ENGINE EXHAUST AREA WHEN THE ENGINE STARTS OR OPERATES. THE JET EXHAUST IS HOT AND OF SUFFICIENT VELOCITY TO CAUSE YOU TO FALL, OR TO CAUSE YOU A BAD INJURY, OR KILL YOU.

WARNING: WHEN THE ENGINE OPERATES, MAKE SURE THAT ALL PERSONS WHO DO WORK NEAR THE AIRCRAFT USE EYE PROTECTION. AT HIGH ENGINE SPEEDS, THE EXHAUST CAN COLLECT AND BLOW LOOSE DIRT, STONES, SAND, AND OTHER UNWANTED MATERIAL A LONG DISTANCE.

WARNING: STAY AWAY FROM THE EXHAUST AREA WHEN THE ENGINE STARTS OR OPERATES. DO NOT BREATHE THE EXHAUST GAS OR LET THE EXHAUST GAS GET IN YOUR EYES. THE EXHAUST GAS CAN CAUSE INJURY TO YOUR LUNGS AND EYES IN AREAS OF HIGH CONCENTRATION.

WARNING: STAY AWAY FROM THE EXHAUST AREA WHEN THE ENGINE STARTS. AT SOME TIME DURING THE ENGINE START PROCEDURE, FUEL THAT DID NOT BURN IN THE COMBUSTION CHAMBER CAN BURN IN THE EXHAUST AREA. THIS CAN CAUSE LONG FLAMES TO BLOW OUT OF THE EXHAUST NOZZLE WHICH CAN BURN YOU.

1 The engine exhaust and fan discharge behind the engine is called the jet wake. Do not go behind the engine during engine operation. This area is very dangerous to persons because of the high temperature and high air velocity.

Direct Thrust Air Intake Suction Danger Area ** ON A/C NOT FOR ALL

(2) Wind direction:

Wind Direction And Velocity Operational Limits ** ON A/C NOT FOR ALL

(a) The wind direction and velocity can change the stability of the engine. Make sure the engine is operated within the defined wind envelope.

Wind Direction And Velocity Operational Limits ** ON A/C NOT FOR ALL

1 The wind velocities shown are for constant wind conditions only.
2 Stop the engine operation if the engine N1 speed is not stable.
3 Stop the engine operation if, at steady state, the inlet noise increases or changes to a blow torch sound.
4 Stop the engine operation if, at steady state, the engine vibration increases.
(3) Tailpipe fires during engine start:
(a) If a tailpipe fire occurs during engine start, shut off the fuel and motor the engine to blow out the fire and decrease the engine exhaust temperature.
(b) For a tailpipe fire, do not obey the starter time limit. Operate the starter until the fire is out and the exhaust temperature is below the limits.
(4) Engine operation:
(a) Before the engine starts, you must remove all loose and flammable material from the engine exhaust and fan discharge area.
(b) Do not operate the engine with persons, vehicles, other aircraft or buildings in the engine exhaust danger area (jet wake areas). The jet wake danger areas are shown on the related figure.

Jet Wake Ground Idle and Takeoff Danger Area Diagram ** ON A/C NOT FOR ALL

(c) Do not operate the engine at minimum idle speed with the cowl doors open because damage to the cowl doors could result.
(d) Aircraft thrust balance during engine operation.
1 Single engine operation is permitted up to N1 = 70%.
2 If higher power is necessary, the thrust of the second engine (non-tested engine or opposite engine) must be equal to N1 = 50%.
(e) Prevent aircraft movement during engine operation.
1 Aircraft must be immobilized by wheel chocks and parking brake.

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.

2 If engine start is followed by a power run above idle, use 98F10103500000 CHOCK-MLG,ENGINE RUN-UP.

Tool Installation ** ON A/C NOT FOR ALL

3 When the tested engine operates above N1 = 70%, the aircraft must be immobilized by brake pedals.
4 When the tested engine operates above N1 = 70% (not tested engine at N1 = 50%), make sure that a total of 6614 lb (3000.06 kg) (minimum) of fuel are in the inner tanks.

NOTE: This minimum fuel quantity does not include the fuel consumption of the engines necessary to do the test. This minimum quantity must stay in the inner tanks at the end of the test.

5 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.
6 If the aircraft begins to move while performing an engine run, immediately set all the thrust levers to idle position.
(f) Thrust lever movements:

CAUTION: YOU MUST OBEY ALL OF THE INSTRUCTIONS FOR THRUST LEVER MOVEMENT THAT FOLLOW. IF YOU DO NOT OBEY THEM, A DETERIORATION OF THE PERFORMANCE CAN OCCUR.

1 Make all thrust lever movements slow and smooth during ground operation unless specified otherwise.
2 If snap accelerations and decelerations are specified, obey the instructions which follow to prevent deterioration of the engine performance.
a Before a snap acceleration, operate the engine at MINIMUM IDLE for at least five minutes after the first engine performance.
b After a deceleration from a high power, operate the engine at MINIMUM IDLE power for at least 20 minutes before an engine shutdown.

NOTE: It is possible to ignore the above recommendations for stabilization times if you do a slow acceleration (120 seconds or longer) instead of a snap acceleration. Normal oil temperature requirements should be obeyed no matter what stabilization is selected.

(5) Engine noise:

WARNING: WHEN THE ENGINE OPERATES, MAKE SURE THAT ALL PERSONS WHO DO WORK NEAR THE AIRCRAFT USE EAR PROTECTION. THE LOUD NOISE FROM THE ENGINE CAN CAUSE TEMPORARY OR PERMANENT INJURY TO YOUR EARS. IT CAN ALSO CAUSE DIZZINESS, WHICH CAN MAKE YOU FALL.

(a) Do not go near the engine when it operates without ear protection.

Jet Engine Noise Danger Area ** ON A/C NOT FOR ALL

(b) The loud noise from a jet engine can cause temporary or permanent damage to a person's ears. This damage can happen after a very short time if the ears are not protected. This damage can cause your hearing and sense of balance to decrease.
(c) The distance you are from the engine is very important for noise damage to your ear. The nearer you are to the engine, the more the danger from the noise.
(6) Oil servicing:

WARNING: DO NOT REMOVE THE OIL TANK CAP FOR A MINIMUM OF FIVE MINUTES AFTER ENGINE SHUTDOWN. THIS WILL LET THE PRESSURE DECREASE. IF YOU DO NOT OBEY THIS INSTRUCTION, OIL CAN SPRAY ON YOU WHEN YOU REMOVE THE OIL CAP.

(a) The oil tank is pressurized during operation. The pressure slowly decreases after shutdown. Do not remove the oil tank cap for a minimum of 5 minutes after engine shutdown (Ref. AMM TASK 79-11-02-000-801).
(7) Fuel and oil:

WARNING: IF POSSIBLE, KEEP FUEL AND OIL AWAY FROM YOUR SKIN. USE PROTECTIVE CLOTHES. FUEL AND OIL CAN DRY YOUR SKIN AND CAUSE SKIN IRRITATION.

(a) Do not let fuel and oil touch your skin when you do maintenance on the engine.
(b) Engine fuel and oil can make your skin dry if it touches your skin for a long time. If the fuel or oil touches your skin, remove the fuel or oil from your skin as soon as possible.
(8) Engine cowl doors:
(a) Fan cowl doors

WARNING: BE CAREFUL IF YOU OPEN OR CLOSE A FAN COWL DOOR WHEN THE WIND SPEED IS 25 MPH (40 KM/H) OR MORE. IF THE WIND MOVES THE FAN COWL DOOR, INJURY TO PERSONS AND/OR DAMAGE TO THE ENGINE AND ADJACENT COMPONENTS CAN OCCUR.

1 Do not open the fan cowl doors for maintenance when the wind velocity is more than 25 mph (40 km/h).

WARNING: DO NOT KEEP OPEN A FAN COWL DOOR WHEN THE WIND SPEED IS 60 MPH (96 KM/H) OR MORE. IF THE WIND MOVES THE FAN COWL DOOR, INJURY TO PERSONS AND/OR DAMAGE TO THE ENGINE AND ADJACENT COMPONENTS CAN OCCUR.

2 After the fan cowl doors are opened, they can stay open for wind velocities up to 60 mph (96 km/h).
(b) Thrust reverser cowl doors

WARNING: BE CAREFUL IF YOU OPEN/CLOSE A THRUST REVERSER DOOR WHEN THE WIND SPEED IS 23 MPH (37 KM/H) OR MORE. IF THE WIND MOVES THE THRUST REVERSER DOOR, INJURY AND/OR DAMAGE TO EQUIPMENT CAN OCCUR.

1 Do not open the thrust reverser doors for maintenance when the wind velocity is more than 23 mph (37 km/h).

WARNING: DO NOT KEEP OPEN A THRUST REVERSER DOOR WHEN THE WIND SPEED IS 46 MPH (74.0 KM/H) OR MORE. IF THE WIND MOVES THE THRUST REVERSER DOOR, INJURY TO PERSONS AND/OR DAMAGE TO EQUIPMENT CAN OCCUR.

2 After the thrust reverser doors are opened, they can stay open for wind velocities up to 46 mph (74 km/h).
(9) Hot engine parts:
(a) After engine shutdown, do not work or make an inspection on the hot section or the exhaust areas for 30 minutes minimum. A longer time is recommended.
(b) It is recommended that you wait 3 - 5 hours after engine shutdown before you do a borescope inspection of the HPC, combustion chamber, HPT or LPT.
(c) As an option, you can air-motor the engine with the starter to decrease the engine temperature.
(d) The temperature inside the engine must be less than 150 deg.F (65.56 deg.C) before you install a borescope inside the engine.
(e) Other engine parts can be examined sooner.
(10) Ignition system:

WARNING: WHILE THE ENGINE IGNITION OPERATES, DO NOT TOUCH THE IGNITION SYSTEM. THE IGNITION SYSTEM USES HIGH ENERGY WHICH IS DANGEROUS. THE IGNITION SYSTEM ENERGY IS SUFFICIENT TO CAUSE AN ELECTRIC SHOCK WHICH CAN KILL YOU.

(a) The engine ignition system generates high energy and high voltage electricity. An electrical shock from this system can kill a person.
(b) Do not touch any parts of the engine ignition system while the ignition system operates. The ignition system usually operates when the engine starts but the ignition system can also operate when the engine is not operated.
(11) Chemical fire extinguishing agents:

CAUTION: DO NOT USE DRY CHEMICAL FIRE EXTINGUISHING AGENTS UNLESS THERE IS AN EMERGENCY. DRY CHEMICAL FIRE EXTINGUISHING AGENTS CAN CAUSE CORROSION OF THE ENGINE GASPATH PARTS.

(a) Dry chemical fire extinguishing agents are not recommended for use in the gaspath of a jet aircraft engines but can be used in an emergency.
(b) If dry chemical fire extinguishing agents are used, if possible, do the steps that follow.
1 If both rotors are free to turn, and the EGT is less than 500 deg.C (932.00 deg.F), dry-motor the engine to blow the extinguishing agents from the engine.
2 Clean the engine gaspath (Ref. AMM TASK 70-27-00-910-806).

CAUTION: DO NOT USE WATER TO REMOVE DRY CHEMICAL FIRE-EXTINGUISHING AGENTS FROM THE ENGINE. WATER WILL CAUSE THE DRY FIRE-EXTINGUISHING AGENTS TO BOND TO THE AIRFOILS AND CAUSE INCREASED CORROSION OF ENGINE PARTS.

3 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. This can cause decreased engine performance, corrosion and more damage if the engine is not cleaned correctly.
(12) X-Ray inspections:

CAUTION: DO NOT X-RAY THE ENGINE WITH THE ELECTRONIC ENGINE CONTROL (EEC) INSTALLED. BEFORE YOU USE X-RAYS, YOU MUST REMOVE THE EEC. X-RAYS CAN CAUSE DAMAGE TO THE EEC.

(a) Remove the EEC before you do any X-ray inspections. It is possible to use X-rays for a diagnostic inspection of the important parts inside the engine. The X-rays can cause damage to the EEC.
(13) Examine the assembly for foreign objects, damage and correct assembly.
(14) Installation of protection covers:

CAUTION: INSTALL PROTECTION COVERS ON ALL THE OPENINGS IMMEDIATELY TO PREVENT DAMAGE TO THE ENGINE.

(a) Make sure that you install COVER - PROTECTION as necessary to prevent damage to the engine.
(15) On the air conditioning panel 30VU, make sure that the engine bleed valves are off (the OFF legend is on).

[Rev.10 from 2021] 2026.04.01 12:37:19 UTC