nose wheel - assembly and disassembly modificado

PASO A PASO TRABAJOS DE MANTENIMIENTO

(Step by Step Maintenance Work)

MPI-F-011 REVISION 12

DATE 2014-10-01

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(1)TRABAJO A EJECUTAR

(Work to be Executed)

NOSE WHEEL - ASSEMBLY AND DISASSEMBLY

(2)O.T. W.O.

H15-106 (3)No. REPORTE (Report)

(4)LUGAR (Place)

Bogotá D.C. (5)FECHA (Date)

03/09/2015

(6)MATRICULA óDESCRIPCION(Registration or

Description)

(7)MODELO óP/N

(Model or P/N)

(8)SERIENUMERO

(SerieNumber)

(9)TSN (10)CSN (11)TSO (12)CSO

HK-5002 C90A

DISASSEMBLY - EQUIPMENT AND MATERIALS:

NOTE: Equivalent replacements are permitted for items that follow:- Tire deflation tool- Valve core tool- Bead breaker

1. WHEEL AND TIRE REMOVAL:

WARNING: IF THE WHEEL WILL BE SERVICED OR DISASSEMBLED, FULLY DEFLATE THE WHEEL AND TIRE ASSEMBLY BEFORE IT IS REMOVED FROM THE AIRCRAFT.

WARNING: THE INSIDE VALVE (VALVE CORE) (25) CAN BE FORCEFULLY EJECTED IF REMOVED BEFORE THE TIRE IS FULLY DEFLATED. USE THE SPECIFIED DEFLATION TOOL.

(13)ITEM(Item)

(14)DESCRIPCION(Description)

(15)TECNICO(Technician)

(16)INSPECTOR(Inspector)

A Use correct procedures to lift the wheel and tire assembly off the ground (refer to the aircraft AMM).

BBefore removal of the tire and wheel assembly from the aircraft, remove valve cap (20) and deflate the tire with a deflation tool (or equivalent). Remove the inside valve (25) from the valve stem (45).

(22)MM P/N(MM P/N)

(23)MM Rev. / Fecha(MM Rev. / Date)

(24)O. Maestra(Master Order)

(25)Sub-O.T. (Sub-W.O.)

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NOTE: deflation tool pin 27117, can

be purchased from:

myers tire supply 1293

south main street

akron, ohio 44301

tel: 330-253-5592

www.myerstiresupply.com e-mail:

[email protected]

CRemove the locking device, axle nut, and axle nut washer from the aircraft axle.

DRemove the outer seal assembly (5) and bearing cone (10) from the axle.

ERemove the wheel and tire assembly from the axle.

FRemove the inner seal assembly (5) and bearing cone (10) from the axle.

2. TIRE CHANGE:

CAUTION: DO NOT USE A PRYBAR OR OTHER TYPE OF SHARP TOOL TO LOOSEN TIRE BEADS BECAUSE THESE TOOLS CAN DAMAGE THE WHEEL HALF ASSEMBLY.

A

Use a bead breaker to loosen the tire beads from the wheel half assembly (70,120) flanges. Apply pressure around the entire circumference of each side wall.

WARNING: WHEEL PARTS CAN COME APART WITH FORCE OR CAN BE DAMAGED IF THE NUTS (50) ARE LOOSENED BEFORE THE TIRE IS FULLY DEFLATED.

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http://www.myerstiresupply.com/

mailto:[email protected]




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CAUTION: BROKEN OR MISSING BOLTS (60) CAN CAUSE UNSEEN DAMAGE TO ADJACENT BOLTS. REMOVE AND DISCARD BROKEN BOLTS AND BOLTS ADJACENT TO THE BROKEN BOLTS.

B

Remove the nuts (50), washers (55), and bolts (60) from the wheel assembly. If nuts are removed with an air wrench, hold the bolts and remove the nuts.

C Separate the two wheel half assemblies (70, 120) from the tire.

DRemove and discard the preformed packing (65) from the packing groove of the inner wheel half assembly (70).

E

Remove the valve stem (45) and grommet (40) from the outer wheel half assembly (120) and discard the grommet.

NOTE: No more disassembly is necessary to change the tire, but if the wheel needs more inspection, continue as follows:

3. DISASSEMBLY OF WHEEL HALF ASSEMBLIES FOR MORE INSPECTION:

A Remove balance weights (80, 130) and attaching hardware nuts (75, 125) and screws (90, 140).

B Do not remove the bearing cups (110, 160) from the wheel half assemblies (70, 120) except to replace them when damaged (refer to the REPAIR section).

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CLEANING

NOTE: Refer to IPL Figure 1 on page 1006 for identification of the parts.

EQUIPMENT AND MATERIALS:

NOTE: Equivalent replacements are permitted for items that follow:

- Solvent, degreasing (MIL-PRF-680 Type II or III)- Water-based cleaners (refer to Figure 401)- Solvent, butyl alcohol- Brushes (solvent resistant)- Compressed air- Paint remover (Cee-Bee E-1092T)- Abrasive blasting equipment- Walnut hulls (A-A-1722 Type II)- Plastic media (MIL-P-85891) Type II- Surface treatment (MIL-C-5541 Class 1A)- Water-based cleaners (MIL-PRF-87937)- Goggles- Water

WARNING: MAKE SURE THE AIR PRESSURE IS NOT MORE THAN 30 P.S.I. (2 BAR). EYE PROTECTION IS NECESSARY. EYE INJURY FROM DIRT PARTICLES OR SOLVENT SPRAY IS POSSIBLE WHEN PARTS ARE CLEANED WITH COMPRESSED AIR.

WARNING: PREVENT CONTACT WITH BUTYL ALCOHOL. USE SKIN AND EYE PROTECTION. BUTYL ALCOHOL IS FLAMMABLE AND DANGEROUS TO THE SKIN, EYES, AND RESPIRATORY TRACT. GOOD GENERAL AIR FLOW IS USUALLY SUFFICIENT.

WARNING: PREVENT CONTACT WITH MIL-PRF-680 TYPE II OR SOLVENT. USE SKIN AND EYE PROTECTION. THIS SOLVENT IS DANGEROUS TO THE SKIN, EYES, AND RESPIRATORY TRACT. GOOD GENERAL AIR FLOW IS USUALLY SUFFICIENT.

CAUTION: DAMAGE TO PARTS OR UNSATISFACTORY CLEANING CAN BE THE RESULT IF THE PARTS ARE NOT CORRECTLY CLEANED WITH AQUEOUS CLEANING PRODUCTS. CAREFULLY OBEY THE MANUFACTURER'S INSTRUCTION

1. CLEAN THE METAL PARTS:

CAUTION: DO NOT USE SAND OR GLASS BEADS IN THE ABRASIVE BLAST PROCEDURE OR A WIRE BRUSH TO CLEAN ALUMINUM PARTS. THIS PREVENTS DAMAGE TO THE PROTECTIVE LAYER ON THE PARTS.

(13)ITEM(Item)




A Clean metal parts with a soft-bristle

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brush and solvent, MIL-PRF-680 Type II or III, or other cleaning products that are given in Figure 401. Use clean, dry compressed air to dry parts.

CAUTION: CONTAMINATION THAT IS NOT FULLY REMOVED FROM THE BOLTS AND NUTS CAN PREVENT FULL INSPECTION OF THE BOLTS AND THE NUTS. CONTAMINATION CAN ALSO CAUSE INCORRECT BOLT TENSION WHEN THE NUTS ARE TORQUED.

B

Make sure that the bolt (60) and nut (50) threads are fully clean. Use clean, dry, compressed air to dry the parts.

C

Apply rust-prevention oil to the bearing cups if they will not be inspected and covered with grease in less than two hours. Remove the oil or grease before inspection of the bearing cups

2. CLEAN THE NON-METAL PARTS:

CAUTION: USE ONLY SPECIFIED CLEANING MATERIALS. SOLVENTS SUCH AS NAPHTHA, THINNER, MIL-PRF-680 TYPE II OR III SOLVENT, ETC. CAN DAMAGE PLASTIC OR RUBBER SEALS AND PREFORMED PACKINGS.

CLEAN ALL RUBBER AND OTHER NON-METAL PARTS WITH A SOFT, CLEAN CLOTH THAT IS MOIST WITH BUTYL ALCOHOL OR A MILD SOAP AND WATER SOLUTION.

3. CLEAN THE BEARINGS:

CAUTION: CONES CAN BE DAMAGED BY IMPACT AND BY CONTACT WITH DIRT, DUST, MOISTURE, OR OTHER CONTAMINANTS. HANDLE CONES CAREFULLY AND WEAR RUBBER GLOVES.

CAUTION: CONES CAN BE DAMAGED IF COMPRESSED AIR IS USED TO SPIN THEM DRY.

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A

Soak the bearing cones in degreasing solvent to remove grease. Flush the bearing cones with solvent and use clean, dry, compressed air to remove all grease.

BFlush bearing cones in degreasing solvent. Let the solvent dry.

C

Apply 5 to 30 weight oil to bearing cones and bearing cups to prevent rust, if they will not be examined and packed with grease in less than 2 hours. Repeat paragraph 3.B. before inspection of the bearing cones.

2. TIRE CHANGE INSPECTION

NOTEReplace all performed packing’s at each tire change or wheel NDT inspection.

A

Inspection of Wheel Halves:

(1) Visually examine the wheel half assemblies (70, 120) for damage caused by nicks, dents, or cracks, Repair damage (refer to the REPAIR section), Do not repair worn, polished areas that are rubbed by the tire. Discard a wheel half that shows signs of rolling contact with the runway.

(2) Visually examine the wheel halves for corrosion. Corrosion is most likely to occur in the tubewell and beadseat areas (where the tire touches the wheel), in holes, and other areas where moisture and contamination can collect. Repair corroded areas (refer to the REPAIR section).

(3) Visually examine the wheel halves for areas where the paint or surface treatment is worn through to

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bare metal. If the wheel will not be NDT inspected at this time, apply surface treatment and paint to the worn areas (refer to paragraphs 5 and 6 in the REPAIR section),

B

Bolt Inspection:

CAUTION: BROKEN OR MISSING BOLTS (60) CAN CAUSE UNSEEN DAMAGE TO ADJACENT BOLTS. REMOVE AND DISCARD BROKEN BOLTS AND BOLTS ADJACENT TO THE BROKEN BOLTS.

(1) Visually examine each bolt (60) for cracks, surface damage, and thread damage. Discard a defective bolt.

C

Nut Inspection:

(1) Visually examine each nut (50) for thread damage and cracks. Discard a damaged nut.

(2) Examine each nut (50) for locking function at each tire change. Install a dry nut on a dry bolt (60) as far as possible by hand. If the end of bolt extends out of the top of the nut, measure the break-away torque of each nut as follows or discard the nut:

Turn the nut onto bolt two or three threads past the end of the nut. Use a torque wrench to remove the nut and measure the break-away torque. Replace the nut if the break-away torque is less than 6.5 pound-inches (0, 7 Nm).

D

Bearing Inspection:

Clean the bearings (refer to the CLEANING section). Visually examine the wear surfaces of the bearing cups (110, 160) and the

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bearing cones (10) as follows (refer to Figure 503).

NOTE: Incorrect bearing grease or axle nut torque can cause some of the defects that follow.

E (1) Spalled Surface - Discard a bearing cone or bearing cup with a spa lied surface (pieces of the surface are missing).

2) Nicks, Dings - Discard the bearing cone or bearing cup with damage that is deep enough to be felt with a fingernail or with a single edged razor blade, Small damage that cannot be felt with a fingernail or razor blade is permitted,

(3) Incorrect Color - Discard the bearing cone or bearing cup that has black, dark blue, and purple stains on the wear surface, which are the signs of overheating. Brown or yellow stains that can be removed easily with abrasive cloth (400 grit or finer) are permitted.

(4) Etched Surface - Discard the bearing cone or bearing cup that has water stains which have etched a wear surface. An etched surface is dull and rough. Water stain discoloration without an etched surface is permitted.

(5) Roller End Damage - Discard the bearing cone if the thrust surface on the large end of

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the rollers has chips, smears, scores, metal pick-up, incorrect color, or other damage, This surface must be smooth not shiny.

(6) Scored Bearing Cone - Discard the bearing cone if it has turned sufficiently on the axle to cause wear on the inner diameter of the bearing cone & seal assembly.

(7) Cage Damage - Discard the bearing cone if the cage is dented, bent, or has too much wear in the roller pockets, Also, discard the cone if it has a polished or worn surface on the cage arm, Do not straighten a bent cage

(8) If the bearing cone damaged in service and is replaced, examine the mating bearing cup for damage. Replace a damaged bearing cup.

(9) Examine each bearing cup (110, 160) for movement in the wheel half assemblies (70, 120), If a 0,002 inch (0,051 mm) feeler gauge can be put into a clearance between the bearing cup and the bottom of the bearing bore, remove the bearing cup to permit inspection and possible repair of the bearing bore (refer to the REPAIR section).CAUTION: DO NOT MIX DIFFERENT BRANDS OF GREASE AS THIS CAN CAUSE DECREASED BEARING LIFE.

(10) Immediately fill satisfactory bearing cone and cups with bearing grease (Mobil Aviation Grease SHC 100. Mobil 28. or AeroShell grease 5). Wrap them in oil-proof paper until they are installed in the wheel. When bearing parts are examined or filled with grease, use the recommended procedures that follow:

(a) Keep a clean work area. Wrap clean bearing cone in new oil-proof paper or plastic film to prevent the collection of contamination.

(b) Hold a clean bearing part with rubber gloves.

(c) Clean the bearing part only with a clean cloth that has no lint.

(d) Keep the grease supply clean. Discard contaminated grease.

F

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Seal Assembly Inspection:(1) Visually examine the rubber lip on the seal assembly (5). Discard a seal assembly that is bent or has a rubber lip that is cracked. nicked. gouged. damaged by heat, or is too hard or too worn to work correctly.

(2) Use the fixture as shown in Figure 504 to measure the lip height of each seal assembly (5). Discard a seal assembly with a lip height that is less than the minimum.

NOTE: Seal assemblies need time (8 hours) after they are removed to return to their correct shape.

GIf the preformed packings (65) and grommet (40) must be installed again, visually examine for cracks, gouges, and cuts. Replace a defective preformed packing or grommet. Satisfactory preformed packings and grommets must have a slight stretch to install.

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NOTE: Preformed packings are compressed during use and need time (48 hours) after removal to return to their correct shape.

NOTE: It is recommended to replace all preformed packings and the grommet at each tire change or wheel NOT inspection.

EQUIPMENT AND MATERIALS:

NOTE: Equivalent replacements are permitted for items that follow, but not for ant-seize compound or dry nitrogen:

Silicone grease, Dow-Corning 55 or grease (Mobil Aviation Grease SHC 100 Product Code 530063, Mobil 28, or AeroShell grease 5) Antiseize compound (MIL-PRF-83483) Bearing grease, Mobil Aviation Grease SHC 100 product code 530063, Mobil 28, or AeroShell grease 5Torque wrenches (accurate to 4% or better) Petrolatum (W-P-236) Dry nitrogen

1. GENERAL INSTRUCTIONS:

NOTE: Replace rubber grommets (40) and preformed packing (65) at each tire change or wheel NOT inspection.

(13)ITEM(Item)




Apply a thin layer of silicone grease (Dow-Corning 55) or grease (Mobile Aviation Grease Product Code 530063, Mobil 28. or AeroShell grease 5) to the preformed packings (65) and petrolatum to the grommet (40) before installing them in the wheel half assemblies (70, 120).

If a bearing cup (110, 160) is removed from the inner or outer wheel half assemblies (70, 120), install them (refer to paragraph 4, BEARING CUP INSTALLATION, in the REPAIR section).

4. WHEEL AND TIRE ASSEMBLY

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A

Install the lubricated preformed packing (65) on the outer diameter groove of the inner wheel half assembly (70). Make sure the preformed packing is not twisted.

BInstall the tire on the inner wheel half assembly (70).

C

Assemble the inner (70) and outer (120) wheel half assemblies, as follows:

(1) Install the wheel halves with the "L" as close to 180 degrees apart as possible when the wheel halves are assembled. The light side of a wheel half is impression stamped with an "L" on the flange.

(2) Align the red dot (or mark) on the tire bead with one of the two valve ports in the outer wheel assembly (120).

NOTE: The red dot (or mark) on the tire should be 2 inches (50,8 mm) or less from the inflation valve location.

D

Apply antiseize compound, MIL-PRF-83483, to the threads and bearing surfaces of the bolts (60), nuts (50), and washers (55) (refer to Figure 701).

NOTE: New wheel assemblies that are shipped from the factory without the tires will have a thin layer of LPS3 lubricant on the bolts (60). Clean the bolts and nuts (50) to remove the lubricant before you apply ant-seize compound. (Refer to paragraph 1, in the CLEANING section).

NOTE: Antiseize compound, MIL-PRF-83483, can separate over a

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period of time. A new container should be fully mixed when first opened. Cover the container when not in use to prevent contamination. Mix every 60 days to prevent separation.

E

Install a washer (55) on each bolt (60). Install a bolt and washer through the inner wheel half. Install a washer and nut. Preliminary torque to 60 - 68 pound-inches (6,8 - 7,7 Nm) in a crisscross sequence (refer to Figure 702).

NOTE: The manual torque wrench or automated wrenching machine must be accurate to 4% or better.

Final torque each nut (50) to 119 - 136 pound-inches (13, 4 - 15, 4 Nm) in a clockwise sequence (refer to Fig. 702). Tighten in one continuous turn of each nut to its final position. Torque the tie bolt nuts #1 and #2 again to make sure that the torque has not been decreased by application of torque to the other nuts.

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WARNING: A TIRE EXPLOSION CAN BE CAUSED BY OVERINFLATION. USE A PRESSURE REGULATOR AND INFLATE TIRES INSIDE A METAL CAGE.

F

Inflate the tire with dry nitrogen to necessary pressure for service (refer to the TEST AND FAULT ISOLATION section). Install the valve cap (20) on the valve stem (45). Dry torque the valve cap to 5 - 10 pound-inches (0, 6 - 1, 1 Nm).

5. WHEEL INSTALLATION:

CAUTION: A MIXTURE OF DIFFERENT BRANDS OF GREASE CAN CAUSE DECREASED BEARING LIFE.

APack the bearing cones (10) with grease (Mobil Aviation Grease SHC 100, Mobil 28, or AeroShell grease

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5). Wipe off excess grease after installation is complete.

B

Apply a thin layer of grease (Mobil Aviation Grease SHC 100, Mobil 28, or AeroShell grease 5) to the bearing cups (110. 160) and the rubber lip of each seal assembly (5).

C

Clean the axle threads and lubricate the threads with bearing grease (Mobil Aviation Grease SHC 100, Mobil 28, or AeroShell grease 5).

D

Install the inner seal assembly (5) and inner bearing cone (10) on the axle. Point the rubber lip of the seal assembly toward the wheel.

EInstall the wheel and tire assembly on the axle.

FInstall the outer bearing cone (10) and seal assembly (5) on the axle.

G

Install the axle washer and axle nut.

NOTE: If the wheel is to be put in storage, refer to paragraph 6 of this section.

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H Axle Nut Torgue:

(1) Turn the wheel in the direction the axle nut is tightened and torque the axle nut to 150 - 200 pound-inches (17-22 Nm) to correctly set the bearings.

(2) Loosen the axle nut to zero torque.

(3) Turn the wheel in the direction the nut is tightened, and torque the axle nut to 30 pound-inch (3, 4 Nm) in one continuous turn of the axle nut. This will prevent incorrect indication of break-away torque that will occur from stop and start turning of the axle nut.

(4) Examine for alignment of the locking holes. If the locking holes are not aligned, continue to tighten the axle nut to the closest locking hole, and lock the axle nut by specified locking procedures.

6. STORAGE INSTRUCTIONS:

If wheel is to be put in storage. lubricate the bearing cups (110. 160) and bearing cones (10) and seal assemblies (5) with bearing grease. Mobil Aviation Grease SHC 100. Mobil 28, or AeroShell grease 5. Install bearing cones (10) and seal assemblies (5) in the wheel assembly bearing bores and install a dust cover over each end of the bore.

Keep the rubber parts in a cool (104 of (40°C) MAX.), dark, dry, no-dust area. Also keep parts away from air flow, radiation, ozone (made by electric arcs, fluorescent lamps, and other electrical equipment), and other contamination.

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NOTE: There is no limit on storage life on grommet (40) or preformed packings (65), that are not installed (reference: SAE ARP5316).

If wheel and tire assemblies are kept in storage for long periods of time, decrease the inflation pressure to 25% (1/4) of usual operation pressure or 40 p.s.i. (2.8 bar), whichever is less. Install the valve cap (20) and dry torque it to 5 - 10 pound-inches (0,6 - 1,1 Nm).

RESPONSABLES (Responsible)

(17)NOMBRE(Name)

(18)FIRMA(Signature)

(19)No LICENCIA(No. License)

TECNICO(Technician)INSPECTOR(Inspector)(20)FECHA DE TERMINACION DEL TRABAJO (AAAA-MM-DD)(Work Completion Date (YYYY-MM-DD))

(21)OBSERVACIONES / Remarks: _________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________

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nose wheel - assembly and disassembly modificado

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