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Locate and Identify Ice Control Components

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Locate and Identify Ice Control Components

    AVAM2100 H1

    AVIATION

    H1 Handout: Aircraft Fluid Line

    Installation Procedures

Program: Aircraft Maintenance Engineer: Category M

Course Name: Aircraft Hydraulics

Course Number: AVAM 2100

100989780.doc Revised: 2001/Jul/27 Page 1 of 5

    AVAM2100 H1

    AVIATION

    H1 Handout

    Aircraft Fluid Line Installation Procedures

    1. Ensure that the line or hose is serviceable and correct for the system where it is being

    installed.

2. Ensure that the insides of lines and fittings are clean.

    NOTE: Oxygen lines and fittings must be clean and free of all traces of oil or grease.

    Special tools and clothing may also be required.

3. Install line with minimum effort.

    ; Check for correct fit, no points rubbing or chafing.

    ; Hose check alignment of lay line.

    ; Allow enough flex to expand/contract after clamping.

4. Tighten fittings (B nuts) until they bottom.

    NOTE: If nut runs tight, check for misalignment, 3? max., also check threads for dirt or

    damage.

5. Final Tightening

    Flared fittings use torque charts attached.

    Flareless fittings - finger tight until it bottoms, then tighten:

    ; " 1 " flat (1/6 turn) MINIMUM

    ; " 2" flats (1/3 turn) MAXIMUM

    NOTE: ALWAYS USE 2 WRENCHES, one for each side of a fitting connection.

    This prevents damage from twisting action on tubes and hoses and prevents scoring

    damage on flares and pilot sleeves.

    “THE ONLY UNIT ROTATING DURING ASSEMBLY SHOULD BE THE NUT”

6. Pressurize/operate system and check lines for leaks.

    IF LEAKS ARE FOUND, CHECK TORQUES AND FITTINGS FOR SCORING

    DAMAGE AND MISALIGNMENT.

    ----DO NOT OVERTIGHTEN TO STOP LEAKS----

    7. Witness mark tightened fittings with a 1/16" line of “Torque Seal” or your own mix of

    nail polish. Do not witness mark fittings on gas turbine engines unless called for by

    manufacturer.

    8. Secure lines by installing correct clamps and/or Koroseal lacing as required to prevent

    damage to lines from expansion, contraction and vibration.

    (See attached charts)

    100989780.doc Revised: 2001/Jul/27 Page 2 of 5

    AVAM2100 H1

    AVIATION

    1. Standard Torque Values for Stud Bolts and Stepped Studs in Aluminum or

    Magnesium.

A. General. The following torque values are for stud bolts and stepped studs,

    installed in aluminum or magnesium, that are held in position by only the locking

    action of the interference fit between mating parts.

    NOTE: These torque values are not applicable to “Lok-Thread” studs.

     Bolt Size Torque (Pound Inches)

     .190-24 35-40

     .250-20 75-80

     .3125-18 135-145

     .375-16 240-250

     .4375-14 370-380

     .500-13 580-600

B. Exception. Studs which have different thread sizes on opposite ends shall be

    torqued to the smaller size regardless of which end is fitted into the installation.

    2. Standard Torque Values for Flared Tubing and Hose Fittings. The following table contains the dimensions of flared tubing and hose fittings and their standard torque values: Tube Steel Tube Torque Thread Size All Aluminum OD Aluminum or Steel Units Parts Nuts

    .125 .3125-24 ----- 35-40 lb.-in.

    .1875 .375-24 30-50 90-100 lb.-in.

    .250 .4375-20 40-65 135-150 lb.-in.

    .3125 .500-20 60-80 180-200 lb.-in.

    .375 .5625-18 75-125 270-300 lb.-in.

    .500 .750-16 150-250 450-550 lb.-in.

    .625 .875-14 200-350 650-770 lb.-in.

    .750 1.0625-12 35-41 75-91 lb.-ft.

    1.000 1.3125-12 41-58 100-128 lb.-ft.

    1.250 1.625-12 50-75 125-150 lb.-ft.

    1.500 1.875-12 50-75 158-183 lb.-ft.

Cont…

    100989780.doc Revised: 2001/Jul/27 Page 3 of 5

    AVAM2100 H1 AVIATION

…cont.

    3. Standard Torque Values for Fittings with Gaskets. The following table contains the

    dimensions of the fittings with gaskets and their standard torque values: Tube Plug Nut Torque Thread Size Nut (AN924) OD (AN814) (AN6289) Units Union (AN815)

    .125 .3125-24 25-35 10-16 25-35 lb.-in. .1875 .375-24 50-75 30-40 50-75 lb.-in. .250 .4375-20 55-80 40-65 75-100 lb.-in. .3125 .500-20 75-100 60-80 90-120 lb.-in. .375 .5625-18 100-150 80-120 150-200 lb.-in. .500 .750-16 180-230 150-200 200-250 lb.-in. .625 .875-14 250-350 200-350 275-400 lb.-in. .750 1.0625-12 420-600 300-500 450-650 lb.-in. 1.000 1.3125-12 50-70 38-50 55-75 lb.-in. 1.250 1.625-12 60-80 50-60 65-85 lb.-in. 1.500 1.875-12 70-90 50-70 75-90 lb.-in.

    4. Standard Torque Values for Jam Nuts of Fitting without Gaskets. The following

    table contains the dimensions of fittings and their standard torque values: Tube Torque Thread Size Aluminum Steel OD Units

    .125 .3125-24 35-50 ---- lb.-in. .1875 .375-24 65-80 70-90 lb.-in. .250 .4375-20 90-105 110-130 lb.-in. .3125 .500-20 105-125 140-160 lb.-in. .375 .5625-18 125-145 225-275 lb.-in. .500 .750-16 140-280 400-450 lb.-in. .625 .875-14 330-370 550-650 lb.-in. .750 1.0625-12 45-55 70-80 lb.-ft. 1.000 1.3125-12 70-80 85-100 lb.-ft. 1.250 1.625-12 80-100 ---- lb.-ft. 1.500 1.875-12 100-120 ---- lb.-ft.

     Cont…

    100989780.doc Revised: 2001/Jul/27 Page 4 of 5

    AVAM2100 H1

    AVIATION

    …cont.

    5.

    TAPER PIPE-THREAD FITTINGS AND PLUGS In Steel Case In Magnesium or Aluminum Case Thread Size Pound- Inches Newton - Meters Pound - Inches Newton - Meters

    1/16-27 35-40 4.0-4.5 10-15 1.1-1.7

    1/8-27 75-125 8.5-14.1 30-40 3.4-4.5

    ?-18 200-250 22.6-28.2 70-85 7.9-9.6

    3/8-18 300-375 33.9-42.4 95-110 10.7-12.-4

    ?-14 400-500 45.2-56.5 140-160 15.8-18.1

    ?-14 500-600 56.5-67.8 175-200 19.8-22.6

    1-11-1/2 600-700 67.8-79.1 230-260 26.0-29.4

    100989780.doc Revised: 2001/Jul/27 Page 5 of 5

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