1、MIL-E-25LLL 28 9 77777Ob OL7333b 4 . - . 1.1 . . . ,;. . . . .-_ p=zz-=y=z: .- -.-.-._ -.z:-211111: - . - i . - .- II_ ,. E:.-.-.-. . . ,“ . -.-.- ,. I . ,-. . .-.- :;. - . -._ . -1. . . . . * . . . -.- _._. -.- -.-I- - ,_._ .-.-. . , . ,._. . -. . . _ . I . -.-_. . t:.-:.-.-.-.:.-:.:.?:.7:.7: ) .-
2、. . “ . - . . . . . . - . i . 1:; . :. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-E-25111(ASG) . pressure shall be acceptable to the using service. thermometer shall be sufficient to insure reasonable accuracy. be so arranged that %he air pa
3、ssing over the wet bulb will not subsequently pass wer the dry bulb. . wick of the wet bulb shall be replaced whenever a perceptible quantity of OS, dirt, incrustation, or other foreign substances has accmulased thereon. Air velocity over the wet bulb The thermoneters shall The wick of the wet bulb
4、shall be kept wet with distilled wzter only. The -.-.-.I. ._._ -. 4.2.1.1.7 Temperature measurements .- Cylinder head temperatures of air-cooled _._ - _._ - -. . . - . engines shall be measured at the position specified on the installation drawing. liquid-cooled engines the cylinder temperature.shaU
5、 be taken at the hottest spark plug gasket. All temperatures shall be reported in degrees Fahrenheit. Other thsrmocouple . The cylinder barrel temperatures shall be taken on the downstream side of the cylinder in the fillet where the cylinder barrel joins with the cylinder holddown flange. In the.ca
6、se Of . . locations may be used in lieu of those mentioned above where called for in tbe model specification. 4.2.1.2 Test engines.- Two identical engines may be used for the tests required by this specification. mine altitude performance data required for the model specification and items covered i
7、n 4.2.2.4.3, 4.3.2.1, and 4.2.2.4.4 entitled IILubrication check,“ “Metering test for refer- ence carburetor,lf and iipropeller oil supply,ll respectively, and other similar special all other specified tests, provided, homver, that the tests specified for Fewer calibra- tion may, at the option of th
8、e using service, be accomplished on either en-e. only one engine is used for the tests required by this specification, the- altitude calibration and other similar Special tests, if required, shaU be acconplished ody down inspection. One of the engines shall be used for calibration runt to deter- . -
9、.- . - .tests when required. The other engine shall be used for the 1f;O-Hour endararice run and . If after coletion of the 1S-Hour endurance run, the Dive test, and the suSsequent Tear- graphs, and other pertinent engine data desired by the using service shall be obtained preferably at the time the
10、 engine is being prepared for test. At the option of . . “ I. - ._ . _. ,_ - -_- -_ 4.2.1.3 Preliminary data.- The engine weight, if not previously obtained, photo- _- . ._. ., . -. . - . 4 , . 2 the procuring activity, the engine may be disassembled for examination or measurement of parts prior to
11、testing. . . . ,-. . . . . . 4.2.1.4 Operating test conditions.- -. . 4.2.1.4.1 General.- For all testing, the fuel octane or perfoniiacce number .-._ . . .-.- . rating, grade of oil, induction system cooler outlet temperatures, and coolaqt outlet temperature shall be as specified in the model speci
12、fication. For air-cooled engines, for all operating periods-longer than 10 minutes duration, the temperature of the hottes% cylinder head shall be that specified for cylinder head temperatures in the nodel speci- na case shall the cylinder barrel temperatures exceed those specified in the model spec
13、i- fication. When cylinder barrel. temperatures become the limiting factor, they shall be . . held to tolerance of plus zero minus 1s Fahrenheit degrees. For liquid-cooled engines, the coolant outlet temperature shall be maintained at the values specified in the model -:.-:.: . specification, within
14、 a tolerance of plus or minus 5 Fahrenheit degrees. Tezperature for dives and idle runs shall be as indicated by test conditions. During takeoff and . . . -_.-_-_.- . -. I . _ _._._. I. .-. . -. -.- . . . .-._. ,-.-.-.-.-.-.-. .-.* ._ _I_-T _-_ _._. -.-.-I. . -. .- .- -._-. -.* . fication, within a
15、tolerance of plus zero minus 30 Fahrenheit degrees, provided that in . i._ . .-. . . . . . . . military power runs, the minimum allowed temperature shall be reached within the first 4 minutes of the run. -I-_-_ - -.-.- . _.- - L . .l_I_I., . r_-.-_.-l_._. b .- I -. -. . , 4.2.1.4.2 Test fuel.- Fuel
16、containing the maximum tetraethyl lead content 1;: - E .: permitted by Specification MIL-F-5572 shall be used for all testing. in testing shall not exceed the minimum knock rating by more than three performance . .- . . ._. . . .- -. 4.2.1.4.2.1 Fuel knock rating.- The knock rating of the fuels spec
17、ified for use % _._ . . . . I -.-.-.I . - -. ,-.- -I.- I .- !.-II ,-.-IC_- -. . .-.- .-. . ._-_ . _ ,. . -. - -.- ,. I._._ . .- , . Kz-.LYz 6 - - I . . . . . K.: . k.y . p: . ,- ) .- . .-.-_._- - . . 1 *= .- . .-.-. ,. L . ,. ,. -,_-_._ . :-_-.-i- . - _._. t:.:.:.:.:. ,. .- -I . , ) - . . t. -.- .-
18、I-. r . .-. . - . . . _.-.-.-.- ) - . -.- I_ , . % “ ,._._ ! . ,. * . . . i i i. . . . . . . , . . -:- a: ._ ._ ., . ., . . . r . . .- . . . J,.- i: Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-HIL-E-25ll1( ASG) 4.2.1.4.11 Fuel and oil consumption
19、.- The specific fuel consumption during each period of the 1SO-Hour endurance run shall be maintained within limits of plus 3 percent and minus zero percent of the values specified in the model specification for the corre- sponding powers and speeds. economy mixture strength; but in no case shallthe
20、 mixture strength be leaner than the leanest mixture strength permitting smooth operation. -. . . . . All periods between the mhum and minimum powers stipu2 lated in the model specification for operation at best economy shall be run with best nod rated power at other than standard normal rated altit
21、ude conditions, the values of fuel consumption shall be those specified for the normal rated altitude. The specifio oil consumption shall not exceed the value specified in the model specification. .x For runs of altitude engines at . I. . . . 1i.2.1.4.12 Accessory drives.- Unless otherwise authorize
22、d by the procuring activity, actual accessories or suitable loading devices, the type of each to be accept- able to the .procuring activity, shall be installed on all accessory drives and operated at normal loads during the 15O-Hour endurance run. shall be made without loading accessory drives. Powe
23、r calibrations of the engine 4.2.1.4.12.1 Power takeoff drive loading.- When required by the using serv- ice, the power takeoff drive shall be loaded by a device adjusted to impose, when the engine is operated at normal rated speed, a torque within plus 5 percent and . ,. - +. . -.- p-. I . . - *_.
24、. . _. - *,.- *I. . . .-.*-.- . . - _._ . . .a .- L. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-E-25LLL 28 W 9779706 03733q3 3 W I . ._ _-.-.-.- I._ e -. _-. I-. I_ . . - . i -.- c_-_- I:-:= .- . . . .- . - . . . . i . . . . . _- -.-. . . UA
25、 ca 4 . rir rl O 0 . . -. . ._ ._. . . . - -.- . . _- . - . rl mmDa ocvzta *mrl mm 9 ? ? 9.9 I 1 r! 1 I r! Cu. Cu. Cu. .-.- -.-.- . . I . :. . . I. rl mzta ccmoCu-.fmP-cD o (u ? ? ? ? ? ? I 1 I I i! I Cu. “1 - . . .- . . . . . . . _- .- .- . . . . - _ -.-. _ _-._._ . - . I . I . _.I_ -. . . _-_-_._-
26、 - . - -. - II_ _ _ I . ztrl ma mrl 114949 CUOP-mmo II? -I ri mama +mo rl Cu m ?1111.? maazfcuo 999599 . ._. . i . . .- I II-.-_._ _II_ _._I._ -.-y -.I -.I.-.-.-I .-I._._._I_-.- . Y ._II. _ .-_I -.-* -. .- _-_ _- .-. -. ,_._._-I . .- . * .-_ . -. . .- . . _-_.-. . _ . c . I._ . - . _. -.- - . _-.L .
27、 I.-.- . _._* - . I: z.1:- . -. - . .-. I . -_ -._. _-_._ - _._ -._.-._-.-_ _-. . - _I._ . - - . . . . t:=:ll:=.:1:11:“: .- I pcD=.tmCuo ?Y? 3 rl rl Cu Cu mmmazfmmaa ?9? manCu rl O 999999 .- -. . . Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-. .
28、_._._. . c (e) Fifth period: 25 hours at alternate periok of 2-1/2 hours each at normal rated power and speed, ar,d at 7Gpercent nord rated power and -percent normal rated speed. and at the maximum best economy cruise power as stipulated ._._ :.=: . - . specification. . nomal rated speed. .- . ._. _
29、I. ,. .- .- .- . ,.-.- -.-*, - . 4.2.2.3.1 Single-stage, twolspeed, supercharged ei;gk,r,es.- For engines equipped p.: “ =:;:III:-:+. . 1 ._.- . -.-. witL two-speed superchargers, the following running, concucteci at a test stand with simulated altitude conditions, shall be substituted for that Fsrk
30、ion of the 1SO-Hour msnt shall be acceptable to the using service.) mere skt;liali?teci altitude test equipment is not available and when operating in the higher geer-rztio, it shall be run in this manner it shall also be permissible to run at. f:d-air rdxture strength rich enough to suppress detona
31、tion. -+“- , . -.-. . _-.-. . ._. -.-. - -._._ , +. . - . - 1.6 eiidurance run specified- in 4.2.2.2, as applicable. (The sklated altitude test equip- . I . - . - . permissible to run at the observed horsepowers obtained h-Lt t.x normal or military rated manifold pressure for the higher gear ratio,
32、or the speclfieg Tercentages thereof. I_-_ . When , . , . . _ . (a) First period: (1) 5 hours at normal rated pow52 and speed at the lower rated altitude in the lower gear ratio. . (2) 5 hours at nomal rated powr ad speea at the higher rated altitude in the higher gear rat-io. 5 hours at 99-percent
33、.nomal. rzted power and V7-percent higher gear ratio.- 10 hours of alternate periods of 5 minutes in each of the supercharger gear ratios. The first 5 minutes of the test shall be conducted at normal rated speed with the higher gear ratio and the observed horsepower obtainable with 90- percent of no
34、rmal rated manifold pressure for the higher . gear ratio under sea level conditions. The conditions for operation for the alternate 5 minutes in the lower gear ratio shall be that obtained by simply shifting to the normal sea level conditions and with a constant speed service. ,-.- i* . ._ - - -._ .
35、 _. . :-=:.: . ._.-._. - -. r_ .I_-. . - . .- . _. - -_ - .- -_ . _._-.-.-.,. I _I.-_ _ - (3) -.-. normal rated speed at the higher rated altitude in the (4) . . I I .-. _. - - -e l-.l._-.-.l.-llY - .-%. _-.-. .- .- ._._-_-.I _.I_.I_.-_- -. . -. .-.-.-. - F: . _.- . _-. . -.-.-.-. , lower gear ratio
36、. This test shall be conducted under I=.i:-z:I-y*.2 propeller, unless otherwisn specified by the using . I. , . - . .-. *. b . .- ._._ . -.-. .- - ,-.-. .- - . -.-, ;*. i*- :* * . . li . , L; , W 1. a b *.:+ -.-. _ _ .,. 6 / . . -. . . . _ . . . . . ., -. . . ._._ . . I. . . .a . , , , . , , . , Pro
37、vided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-E-25LLL 28 7777706 0373345 5 I MIGE.PSlll(ASG) (c) Remainder of endurance run: Engines equipped with two- speed supercharger shall be operated in the lower gear ratio at powers based on the noniial rat
38、ed power at the lower normal rated altitude, except when the use of the higher gear ratio is required for operation at takeoff or military rated power md further, except that during the last 1/2 hour of the running specified for the IWghth 10-minute periods spaced 10 minutes apart in the higher norm
39、al rated power nor less than 70-percent kigh gear ratio period,“ 4.2.2.2(h), the engine shall be operated for two gear ratio at not less than 60-percent high gear ratio A normal rated speed. . . L . . c .-.-.- 4 -% _ . -_.-_._.-._ - -.-.h . , . 1 I . 4.2 . 2.3 . 2 Two-stage, multispeed, supercharged
40、 engines. - :;.:. . .-. 4.2.2.3.2.1 For engines designed with main and adliary stage impellers on a common shaft, the test schedule specified for IITwo-speed, singlestage, supercharged For engines designed with integral tk-stage superchargers, .with means for declutching or providing multispeeds for
41、 the awdfiary stage supercharger and wIiich require external intercooling, the 150-Hour .endurance run shal be conducted in accordance with Schedule A if altitude test stand equipment is not available. “ - -._ -* ._.-I- -.- - -_.-I.- engines,“ under 4.2.2.3.1 shall be applicable. -.-_.- _-_._ -._ I_
42、._ . -_ . + -.- . - h.2.2.3.2.2 _I_ -. . I- -.- . . -.- . , -. _._ ._ ._ - . . - -. -. _-. I_ _ -.- .- - . ._ . . .- - -._-_ . -. *_-.-.-. _ . _ . .-_. . ._ ._._._._.Li. _._.-I- -. -.- ._- . - . . _-._-._- -.-_._ 4.2.2.3.2.2.1 Schedule A.- .-. (a) First period: -.II-. - -._ .- - (1) 15 hours of alte
43、rnate periods of 2-1/2 hops each at normal rated power and speed, and at 90-percent normi rated power and 97-percent normal rated speed, with . main stage supercharger only in operation. (2) 7 hours of alternate periods of 3-l/2 hours each at . - . .- _. . . - . . .-.-_ . .-. “ ._ . -_ i_ _-_._.- no
44、d rated power and speed, and 90-percent nomal rated power and-97-percent normal rated speed, with main stage and low speed auxiliary stage only in operation. LI- .-. . . -. _ . . . . I . c_ . -. . .-.- -.-.-.*.- A_ _-I.-. _-._ . - . -I. _- . _-._ .*.I_. - (3) 3 hours of alternate periods of 142 hour
45、s each at rated power and 97-percent normal rated speed, with . normal rated power and speed, and 90-percent normal . main stage and high speed auxiliary stage only in - - -. . -.- -. - .-. -. I-.- _I_-._ -_ _-_- .-.- . - -_._._-.-.-.- - _ -_.,. _ . - . -.-.- -.-. -_.I. -_-.I- ,.-._ . - - - -.-.- -
46、. I_ - I -. ,.-. - L -. I , at military rated power and speed, and 30 nrinutes at a ,u -.U- selected speed between 55 and 65 percent of military rated speed, without change of propeller pitch. this period shall be with main stage wdl.p speed auxiliary stage in operation, and 5 hours shall bkwith main stage and Five hours of I_ . . high speed auxiliary stage in operation. -. - - . L , - . , .- . ,. . .-.-. . . - - - - - -. - . ,_-._. . - . -. f lo _ ._-. -. . . . . . -. . . Provided by IHSNot for ResaleNo reproducti
