TM 1-1520-240-107-1-2 b. Calculated Data. Data based on tests, but not onflight test of the complete aircraft.c. Estimated Data. Data based on estimates usingaerodynamic theory or other means but not verified byflight test.7-1-6. Specific Conditions.The data presented is accurate only for specific condi-tions listed under the title of each chart. Variables forwhich data are not presented, but which may affect thatphase of performance, are discussed in the text. Wheredata is available or reasonable estimates can be made,the amount that each variable affects performance will begiven.7-1-7. General Conditions.In addition to the specific conditions, the following gener-al conditions are applicable to the performance data.a. Rigging. All airframe and engine controls areassumed to be rigged within allowable tolerances.b. Pilot Technique. Normal pilot technique isassumed.c. Aircraft Variation. Variations in performancebetween individual aircraft are known to exist: however,they are considered to be small and cannot be accountedfor individually.d. Instrument Variations. The data shown in theperformance charts does not allow for instrumentinaccuracies or malfunctions. e. Airspeed Calibrations. The airspeed calibrationchart presents the difference between indicated airspeed(IAS), and calibrated airspeeds (CAS) for different flightconditions.f. Except as noted, all data is for clean configuration(all doors installed, without armament).g. Types of Fuel. All flight performance data is basedon JP-5 fuel. The change in fuel flow and torqueavailable, when using JP-4, JP-8, Aviation gasoline orany other approved fuels, is insignificant.7-1-8. ERFS II Performance Data.Use of the performance data will enable the operator toreceive the maximum safe utilization of the ERFS II andFARE kit.7-1-9. ERFS II Tank Capacity.The capacity of the ERFS II tank using pressure refuelingis 805.5 US gallons. If filled using gravity refueling, thecapacity is 825.5 US gallons (In both cases 5.5 GALS willbe unusable).7-1-10. Amount of Unusable Fuel.7-1-11. Fuel Transfer Rate.The amount of unusable fuel in each of the ERFS II tanksis 5.5 US gallons of JP-8.The rate at which fuel is transferred from the ERFS IItanks to the helicopter main tanks is 23 GPM.7-1-12. FARE Transfer Rate.The FARE kit pump is rated at 120 GPM. However, theconfiguration of the FARE fuel transfer hose assemblyaffects this transfer rate. Pressure losses across cou-plings, filters, and nozzles reduce the flow rate below therated value. The rate at which fuel is transferred from theERFS II tanks using the FARE pump and standard con-figuration of the FARE fuel transfer hose assemble is 84to 88 GPM.7-1-13. Performance Discrepancies.Regular use of this chapter will allow you to monitor in-struments and other aircraft systems for malfunction bycomparing actual performance with planned perfor-mance. Knowledge will also be gained concerning theeffects of variables for which data are not provided,thereby increasing the accuracy of performance predica-tions.7-1-14. Definitions of Abbreviations.Capitalization and punctuation of abbreviations varies,depending upon the context in which they are used. Ingeneral, full capital letter abbreviations are used in textmaterial, charts and illustrations. Periods do not usuallyfollow abbreviations; however, periods are used with ab-breviations that could be mistaken for whole words if theperiod were omitted.
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