B. The Air Intake (Fig. 201).
WARNING: BECAUSE OF EXTREME DANGER NEAR THE ENGINE INLET, SIDES OF THE INLET, AND ENGINE EXHAUST, PERSONNEL SHALL AVOID THESE AREAS DURING ALL POWER PLANT GROUND OPERATION. ON ENGINE NACELLES THAT HAVE HAZARD AREA MARKINGS, THE INLET HAZARD AREAS ARE HIGHLIGHTED BY A RED WARNING STRIPE, NO ENTRY PLACARD, ABOVE IDLE HAZARD AREA PLACARD, AND WARNING PLACARD. WHENEVER PERSONNEL ARE POSITIONED AT THE SIDES OF THE ENGINE, PARTICULAR ATTENTION AND AWARENESS MUST BE PLACED ON THE HAZARD AREAS LOCATED FIVE FEET AFT OF THE NOSE COWL INLET PLANE. THIS HAZARD AREA EXTENDS COMPLETELY AROUND THE OUTER DIAMETER AND FORWARD END OF THE POWER PLANT.
CAUTION: PERSONNEL SHALL EXERCISE CARE TO ENSURE THAT HELMET, HEADSET, HATS, GLASSES, WIPE-RAGS, AND ARTICLES OF CLOTHING ARE STRAPPED SECURELY IN POSITION OR REMOVED BEFORE WORKING AROUND THE ENGINE. NO EFFORT SHALL BE MADE TO RETRIEVE EQUIPMENT DROPPED NEAR THE ENGINE INTAKE BUT THE THRUST LEVER SHALL BE RETURNED TO THE FULLY RETARDED POSITION AND THE START LEVER IMMEDIATELY MOVED TO CUTOFF POSITION.
CAUTION: PERSONNEL DANGER AREAS SHALL RECEIVE SPECIAL CONSIDERATION WHEN POSITIONING PERSONNEL, EQUIPMENT, VEHICLES, OR OTHER AIRCRAFT IN PROXIMITY OF OPERATING ENGINE.
CAUTION: BEFORE OPERATING ENGINE, CHECK THAT ENGINE INLET, UPPER SURFACE OF WING AND FUSELAGE, AND RUNUP AREAS ARE FREE OF SAND, GRAVEL, LOOSE OBJECTS, OR EQUIPMENT THAT COULD BE DRAWN INTO THE ENGINE INLET OR THROWN AFT BY THE EXHAUST BLAST.
CAUTION: CLEAR AREA SURROUNDING ENGINE OF ALL SNOW AND ICE. EXTENSIVE DAMAGE TO COMPRESSOR BLADES CAN BE CAUSED BY THE ENTRANCE INTO THE ENGINE OF RELATIVELY SMALL PIECES OF ICE.
C. Exhaust Characteristics (Fig. 201).
(1)
Velocity. At high engine speeds the exhaust may pick up and blow loose dirt, sizeable stones, sand and debris a distance of several hundred feet. Therefore, due caution must be used in parking the aircraft for runup to avoid injury to persons or damage to property or other aircraft. A blast fence is suggested if the engines are going to be run up for trim and power adjustment in an area where there is not sufficient space available for dissipation of the exhaust blast.
(2)
Temperature. High temperature will be found up to several hundred feet from the exhaust nozzle depending on wind conditions. Closer to the engine the exhaust temperature is high enough to deteriorate bituminous pavement, therefore concrete aprons are suggested for runup areas. Occasionally when a jet engine is started, excess fuel that has accumulated in the tailpipe ignites and long flames are blown out of the exhaust nozzle. The possibility of this hazard must be watched and all flammable materials kept in the clear.
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71-09-100 Page 202 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. Jun 20/84
P&WA 72-00, Page 501, May 15/64
(3) Toxicity. Tests have indicated that the carbon monoxide content is low but other gases are present which have a disagreeable odor and are irritating in effect. Exposure will usually cause watering or a burning sensation of the eyes. Less noticeable but important is the respiratory irritation, which may be caused. For both these reasons exposure must be avoided, particularly in confined spaces or pockets where the concentration may build up.
D. Engine Ignition
WARNING: THE JT8D ENGINE IGNITION SYSTEM IS CHARACTERISTICALLY HIGH IN ENERGY. THE NATURE OF THE SYSTEM IS SUCH AS TO RENDER IT A HAZARDOUS, POSSIBLY FATAL, SOURCE OF ELECTRICAL SHOCK UNLESS THE NECESSARY PRECAUTIONS ARE EXERCISED. DO NOT TOUCH IGNITER PLUGS WHEN THE IGNITION IS ON. DO NOT TEST THE IGNITION SYSTEM WHEN PERSONNEL MAY BE IN CONTACT WITH IGNITER PLUGS OR WHEN FLAMMABLE MATERIALS ARE NEARBY. SPECIAL PRECAUTIONS MUST BE OBSERVED BY ALL WHO HANDLE RADIOACTIVE SPARK-GAPS USED IN BENDIX-SCINTILLA IGNITION SYSTEMS. SEE CHAPTER 74, IGNITION.
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