Service Bulletins Letters

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VACUUM SYSTEM

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TTP B1-L3 ATA37 Cessna 172 B2-L2   V acuum system has a filter, vacuum gage, vacuum instruments, regulator valve, vacuum manifold,  low vacuum annunciator switches, engine-driven vacuum pumps and related plumbing.   With   Garmin G1000, the source of vacuum air is in the cabin and is pulled through the  system by the engine-driven vacuum pumps. This air goes through the gyro filter at the cabin inlet source  before it goes through the vacuum gage and gyro instruments. The vacuum is controlled by the regulator  valve. The regulator valve is on the aft side of the firewall. The vacuum air is then pulled through the  vacuum manifold and past the low vacuum annunciator switches and then into the vacuum pumps. Without Garmin G1000, vacuum pressure is measured by the low vacuum annunciator   switches in the engine compartment. The vacuum gage in the instrument panel shows the vacuum  pres...
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WINGS AND WING STRUTS

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TTP B1-L3 ATA57 Cessna 172 B2-L1 Wing is a strut braced type, with two main spars and suitable ribs for the attachment of the  skin. Skin panels are riveted to ribs, spars and stringers to complete the structure.  All metal , piano  hinged aileron, flap and detachable wing tip are mounted on each wing assembly.  Each wing also  incorporates an integral fuel bay located between the two spars at the inboard portion of the wing.  Each  wing is supported in position by a single lift strut which consists of a streamlined tube riveted to two end  fittings for attachment at the wing and at the fuselage.     PTP B1-L1 ATA57 Cessna 172 B2-L1 571001 Wing Surfaces and Tips - Inspect for skin  damage, loose rivets, and condition of paint.    571002 Wing Struts and Strut Fairings - Check for  dents, cracks, loose screws and rivets, and  condition of paint 571004 Wing Spar...
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LEVELING

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TTP B1-L1 ATA08 Cessna 172 B2-L1             PTP Cessna 172 B1 LOC SGH B2 LOC SGH Required tools, equipment and materials-. Leveling Points Lateral Leveling. (1) Find two points that are the same on each upper door sill of the left and right cabin doors. (2) Put a level in position across these points. NOTE: Out-of-level tolerance for wing tips is three inches total. (3) Make a note of the airplane's lateral position. (4) If applicable, put jacks in position at the wings and tail jacking points. (a) Adjust the wing jacks as required to get the necessary lateral position. Longitudinal Leveling. (1) Find the two screws on the left side of the airplane tailcone that are in line with water line zero. (2) Remove the screws. (3) Install studs or long screws of applicable length (approximately two inches long). (4) Put the level...
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