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Servicing a landing gear strut
Bleeding

Aviation Structural Mechanic (H&S) 3&2 - How airplanes are built and how to maintain them
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AEROL INFLATION .INSTRUCTION nLc*RoILss OrAlnCR*r? rclw? YCD. BY *Ho STRUT fRIC? IOU, II STRUT THE CLEVELAND PNEUMATIC TOOLCO. DIYCMSIOW .X- 18 YCAWRCD AWO DIVISION Dr CIC~CLAND ?wCuwr?~C ?acssunC OIVCM IN TWL TABLL to l*DUS?RlCS NC, CLCVCLAwD,O)crO,U.SA WC LCFT, DOES NOT CDRICSPDMD IOR CRU~MAW AlRCRA,lT ~NCI~CCIIWG CORP. TO THAT Ill  STRUT, AIR SHOULD BCTHPACC, LOW6 ISLAMD,M Y.,u$A BC ADDCD - RCYOVLD Al nCOUIIILo. SERIAL NO. TYPE OROER NO. DESIGN NO. aas SW 408 414 42a 432 44t 452 4as 474 4lb 498 4 St4 SIO SPECIFICATION NO. 4  WI S24 TO CHECK  FLUID LEVEL 4 l/2 bS0 4  a/a 8SS I. nCM0VC VALVE CAP FROM HIGH PItStURK AIR VALVC (US tBSS@-I). 4  I/4 sia 2. SLOWLY DlSCb4AR.t ALL AIR BY Tm&lkC SWWCL MUTtTURw COUk- 4 t/a TCXCLDCXWISC) WOTt@ RATC OI DlSCHAZI6C It CSTABLISMCO BY 4 UOS AYDUWI SUIVCL nut IS LOOSCMCO. a I/@ @I7 S. RCUOVL fOMPLC?C AIR VALVE ASBCYOLY AND FILLYTRU? WITW MIL-M-3604 (RCD COLOR) TO LCVCL Of FlLLtR HOLE Wltn STRUT a s/4 641 111 NORMAL OI)oUWD *DSlflDN. a 6/O 6aa 4. RCPLACC COMCLt ft AIR VALVE ASStM)LT A*0 ?lUH?CM &OOY 10 lDO- a v2 (1.1 110 ‘4. LBS.?OROUC ANDJRCPLACL LOCUWIRC THCN tNrLATC S?RU?. SCC 10 IWCATC SYRU?. a a/u 710 b. llCCLACf AN0 TlQMlCN VALVE CAP. a l/4 7s) a I/* 74s TO INFLATE STRUT 3 7*t 2 7/o 82s I. RCHOVC VAWL CAP  AHD ATTACH AIR FILLCR CWUCR  TOHIGH PRCt5URt l 2 ad4 8s) A111 VALVt. 2. ~0DS2.w SWlVtL NUT [TURN COUNTCRCLOCKWIS~) 4 MAX OF 2VL TURNS 2 we 089 A*0 INFLATC STRUT USING Ala6288 -2 l RtfSUIC UACC ADJUST 2 I/2 *a* PRCSSUIIC IN ACCDROAkCC Wltk INtLA?ION IktllUC?lONS. 2 B/8 S(I) 3. TlCcctEM SWIVTL NU? YO 30-70 IN.LBS.?ORQUC (TURN CLOCKWISCB 2  I/4 lOf4 RCWOVC AIR FILLER CHUCK,CMCCX FM LtAKS AN0 RC?LACL VALVE 2 I/O 1092 C*r. .2 1150 I  7/m I2 22 I Y4 129s Y4 i&St FULLY COUP Figure 12020Aanding gear strut servicing instruction plate. 3. Release the air pressure in the strut by slowly turning the air valve swivel nut counterclockwise approximately 2 turns. This action can normally be accomplished with the use of a combination wrench. WARNING When loosening the swivel nut, ensure that the 3/4=inch hex body nut is either lockwired in place or held tightly with a wrench. If the swivel nut is loosened before the air pressure has been released, serious injury may result to personnel. 4. Ensure that the shock strut compresses as the air or nitrogen pressure is released. In some cases, it may be necessary to rock the aircraft after deflating to ensure complete compressing of the strut. 5. When the strut is fully compressed, the air 9. Inflate the strut, using a regulated high- valve assembly may be removed by breaking the safety pressure source of nitrogen or dry air. Under no wire and turning the 3/4=inch body nut counter- circumstances should any type of bottle gas other than clockwise. nitrogen or compressed air be used to inflate shock 6. Use the type of hydraulic fluid specified on the shock strut inspection plate to fill the strut to the level of the air valve opening. Figure 12-20 shows the instruction plate found on one type of aircraft main landing gear strut. NOTE: The instruction plate may be found on the strut or on the wheel door near the strut. Improper oil level in the strut chamber will decrease the shock absorbing capabilities of the strut and could cause the strut to bottom out during landing. This would damage the strut and/or wing structure. 7. Reinstall the air valve assembly, using a new O-ring packing. Torque the air valve body hex nut from 100 inch-pounds to 110 inch-pounds, as shown in view B of figure 12-19. 8. Lockwire the air valve assembly to the strut, using the holes provided in the body nut. 12-24







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