MAINTAINABILITY DESIGN TECHNIQUES METRIC - AcqNotes.com

More documents

Recommendations

Info

Downloaded from http://www.everyspec.com on 2011-10-29T14:56:01.DOD-HDBK-791(AM)TABLE 4-5. RECIPROCATING ENGINE ACCESSORIES THAT SHOULD BEACCESSIBLE FOR INSPECTION, CLEANING, ADJUSTMENT,REMOVAL, AND REPLACEMENTInspection, Cleaning, and AdjustmentMagneto breaker pointsOil pressure relief valveOil tankOil cleaner or strainerFuel tankFuel pressure relief valveFuel strainerDrain valvesCarburetor or fuel injection systemCarburetor air filtersSuction relief valveFeathering pumpPropeller governorTurbosuperchargerTurbosupercharger regulatorAutomatic controlsRemoval and ReplacementSpark plugsMagnetoStarterGeneratorTachometer generatorHigh tension wiringRadio shieldsTemperature control actuatorTemperature control actuator motor brushesOil tanks, not integralOil cleaner or strainerOil pumpOil pressure relief valveOil booster pumpFuel pumpFuel booster pumpFuel strainerCarburetor fuel strainerCarburetor air filterdrives and their related accessories in the bottom, or sixo’clock, engine position along the compressor sectionbecause present aircraft design makes this the mostaccessible position.9. Mount engine accessories so they are accessiblefor inspection, cleaning, adjustment, or removal withoutremoval of the engine or other important power plantstructures.10. Design the power plant installation so that alldaily and preflight inspections can be made in coldweather when the operator is wearing heavy gloves andbody clothing. In particular, provide proper accessibilityto fuel and oil drains.11. Provide an opening in the engine cowling forground heaters. This opening should have either an accessorydoor with a minimum diameter of 305 mm (12 in.) oran easily removable section of cowling of equivalent size.Locate the door or opening so that it may be used forconvenient servicing of oil and fuel drains. Considergrouping the drains, especially the main oil and oil tanksump drains, near the accessory door opening. Stencil theWater injection pumpExhaust stacks and collectorFlame damperExhaust gas heat exchangerTurbosuperchargerTurbosupercharger regulatorAutomatic engine controlsSuction relief valveVacuum pumpHydraulic pumpDeicing pumpAccessory gear driveCabin supercharger (mechanical)Fuel injection pumpsFluid shutoff valvesOil coolerOil cooler control valveFuel injection controlCarburetor or fuel injection systemaccessory door or cowling section with “OPEN FORGROUND HEATER DUCT”.12. In turbine-powered aircraft adequate provisionsshould be incorporated into the cooling system and structurefor rapid inspection, repair, and replacement of thetailpipe, flexible coupling, and all components of thesystem, such as ejector shroud, insulation blanket, cooling-airshutters, diverters, and controls. If the systemdesign incorporates an ejector shroud, it should be fabricatedor assembled on the tailpipe so that it is removablewith this unit.13. Design the turbine with a removable housing sothat the rotor blades are visible. This feature makesinspection of every blade possible by rotation of the turbinewheel.14. Mount the turbine stator and rotor blades sothey can be removed, inspected, and installed individuallyby hand (see Fig. 4-36). If it is necessary to change a blade,the retaining plate is unscrewed and blades are slipped outby hand and inspected. When a damaged blade is reached,a new blade is slid in, and the retaining plate is replaced.4-26
Downloaded from http://www.everyspec.com on 2011-10-29T14:56:01.DOD-HDBK-791(AM)TABLE 4-6. TURBINE ENGINE ACCESSORIES THAT SHOULD BE ACCESSIBLE FORINSPECTION, CLEANING, ADJUSTMENT, REMOVAL, AND REPLACEMENTInspection, Cleaning, and AdjustmentMain fuel controlStarting fuel controlEmergency fuel controlGovernor (speed)Suction relief valveActuator motor brushesAutomatic controlsSump plugs and drain valvesSpark plugsVariable nozzle area unit and controlOil pressure relief valvesOil tankOil cleaner or strainerFuel filterFuel pressure relief valveFuel nozzleBarometric unit (fuel control)Control valve (idling speed)Removal and ReplacementOil cleaner or strainerOil pumpOil pressure relief valveOil coolerOil temperature relief valveBooster pumpFuel pumpFuel strainerFuel regulator unit or control unitFuel nozzleDrip valveFlow divider (fuel system)Pressure bypass valve (fuel system)Main fuel controlStarting fuel controlEmergency fuel controlThermal unit (fuel system)Barometric unit (fuel control)Water tank or thrust augmentation fluid tankAutomatic engine controlsDrain valvesSpark plugsIgnition coilStarterGeneratorTachometer generatorHigh tension wiringRadio shieldingTemperature control actuatorTemperature control actuator motor brushesOil tanks, not integralSuction relief valveVacuum pumpHydraulic pumpAccessory gear driveAir filter (bearing cooling)Air filter (vents)Tailpipe (extension)Reducer (variable nozzle area)Governor (RPM)Oil shutoff valve4-6.7.3 Landing GearsConsider the following accessibility recommendationsin the design of landing gear:1. Design all units of the alighting gear to be accessiblefor lubrication, service, inspection, and replacement.2. Design all hydraulic mechanisms so that theirfiller plugs, bleeder plugs, and air valves may be readilyserviced with air and fluid.3. Provide sufficient clearance between the shockabsorber packing gland nut and adjacent parts of theaircraft when the shock absorber is fully deflated so thatthe nut may be readily adjusted with a wrench.4. Design all shock absorber struts so that the extentof inflation may be determined without removing thecowling or using any measuring device other than a scale.Figure 4-36. Mount Stator and Rotor Bladesto Facilitate Removal of Individual Blades4-6.7.4 Mechanical ItemsConsider the following accessibility recommendationsin the design of mechanical items:4-27
Page 3 and 4:
Downloaded from http://www.everyspe
Page 6:
Page 9 and 10:
Page 11 and 12:
Page 13 and 14:
Page 15 and 16:
Page 17 and 18:
Page 19 and 20:
Page 21 and 22: Downloaded from http://www.everyspe
Page 71: Downloaded from http://www.everyspe
Page 123 and 124:
Page 125 and 126:
Page 127 and 128:
Page 129 and 130:
Page 131 and 132:
Page 133 and 134:
Page 135 and 136:
Page 137 and 138:
Page 139 and 140:
Page 141 and 142:
Page 143 and 144:
Page 145 and 146:
Page 147 and 148:
Page 149 and 150:
Page 151 and 152:
Page 153 and 154:
Page 155 and 156:
Page 157 and 158:
Page 159 and 160:
Page 161 and 162:
Page 163 and 164:
Page 165 and 166:
Page 167 and 168:
Page 169 and 170:
Page 171 and 172:
Page 173 and 174:
Page 175 and 176:
Page 177 and 178:
Page 179 and 180:
Page 181 and 182:
Page 183 and 184:
Page 185 and 186:
Page 187 and 188:
Page 189 and 190:
Page 191 and 192:
Page 193 and 194:
Page 195 and 196:
Page 197 and 198:
Page 199 and 200:
Page 201 and 202:
Page 203 and 204:
Page 205 and 206:
Page 207 and 208:
Page 209 and 210:
Page 211 and 212:
Page 213 and 214:
Page 215 and 216:
Page 217 and 218:
Page 219 and 220:
Page 221 and 222:
Page 223 and 224:
Page 225 and 226:
Page 227 and 228:
Page 229 and 230:
Page 231 and 232:
show all

MAINTAINABILITY DESIGN TECHNIQUES METRIC - AcqNotes.com

You also want an ePaper? Increase the reach of your titles

Delete template?

Save as template?