1969–1976 Cessna 172K/L/M, Skyhawk, Skyhawk II & Reims F172 OEM Service Manual (P/N D972-13)

This Cessna factory service manual, P/N D972-13, covers the 1969–1976 172, Skyhawk, Skyhawk II, and Reims F172 series. The cover identifies Change 3, dated June 15, 1975; the file also contains later replacement pages and a service manual change notice.

Text search, chapter links, and drawing detail: Embedded OCR supports searches through the service chapters, but many wiring-diagram labels are poorly recognized or unavailable to search. Chapter bookmarks open the main sections. Small wiring labels require enlargement for comfortable reading. Seat-installation illustration pages 3-14A and 3-14B are missing from this file.

• Airframe repair: Windshield repair, door installation, wing and empennage removal, structural damage assessment, and control-surface balancing procedures.

• Landing gear and brakes: Main-wheel alignment checks, wheel assembly servicing, hydraulic brake bleeding, nose-strut service, and shimmy-dampener overhaul.

• Flight controls: Aileron, elevator, rudder, and trim-tab rigging, plus electric wing-flap troubleshooting, actuator replacement, and limit-switch adjustments.

• Engine and propeller: Engine removal and installation, control rigging, magneto timing, accessory servicing, exhaust inspection, and fixed-pitch propeller installation.

• Fuel and instruments: Fuel-tank and selector-valve servicing, vent checks, fuel-quantity transmitter calibration, pitot-static leak testing, and vacuum-system troubleshooting.

• Electrical systems: Battery, starter, alternator, and lighting diagnosis, supported by circuit diagrams, component troubleshooting charts, and electrical load analysis.

Written as a reference for experienced aircraft mechanics, the manual also provides step-by-step procedures for mechanics with less experience.

Lycoming and Continental Engine Installations

Separate chapters cover Lycoming O-320-E2D “Blue Streak” and Rolls-Royce/Continental O-300-D installations. The 172K/L/M and Reims F172L/M use Lycoming engines; the Reims F172H/K use the O-300-D.

Oil-system troubleshooting includes pressure and temperature complaints. The Engine Oil Schematic illustrates the Continental lubrication circuit, and that chapter identifies oil-filter adapter tool SE-709. Full internal engine overhaul and detailed propeller repair depend on separate manufacturer publications.

Landing Gear and Electric-Flap Variants

The landing-gear chapter separates shim-adjustable flat spring gear from tubular gear, whose camber and toe-in are checked without shim adjustment. Cleveland and McCauley wheel assemblies have separate service details.

Electric-flap procedures distinguish earlier freewheeling transmissions from limit-switch-controlled installations beginning at serials 17259905 and F17200805, with separate treatment of modified aircraft and Service Kits SK150-37 and SK150-41. The Flap System Schematic and configuration-specific checks help a mechanic select the applicable rigging procedure before adjustment.

The flap section addresses actuator damage caused by failure to stop the motor at travel limits on the applicable installations. The bonded-axle change notice explains why heat removal of an aluminum axle requires axle replacement.

Fuel, Instrument, and Wiring Diagnosis

The Fuel System Schematic maps the gravity-fed tank, selector, strainer, and primer arrangement. Vent-system checks address fuel starvation and tank damage associated with restricted venting.

Instrument procedures cover both wet- and dry-vacuum systems. Static Test Equipment and Vacuum System illustrations accompany leak-testing and troubleshooting information. Internal instrument repair is referred to specialist facilities.

Wiring diagrams distinguish earlier configurations from the 1976 arrangements and cover the split-bus electrical system. Brittain wing-leveler checks are included, while Nav-O-Matic autopilot and electronic communications/navigation equipment servicing require separate publications.

Structural Repair and Workshop Reference Data

Structural repair coverage distinguishes repairable damage from conditions requiring replacement. Skin, rib, spar, bonded-door, and hard-landing damage receive separate treatment. Checking Wing Twist illustrates the alignment check, alongside control-surface balancing instructions for work following repair or repainting.

You get detailed reference stations for both early and late-model fuselage and wing configurations. Fine- and coarse-thread nut torque tables, fluid-capacity specifications, wear limits, and inspection charts provide the supporting shop data.

Ground handling, lubrication, 100-hour inspections, and Progressive Care program guidance are included; the dedicated Progressive Care manual is separate. Utility-system coverage addresses cabin heating, defrosting, and ventilation, followed by exterior-painting information.

Maintenance and repair work should be performed or supervised by an A&P-certified mechanic in accordance with current regulations.

PDF Contents and Included Change Pages

This is a 414-page PDF, including the cover, front matter, and blank pages. That total includes the two-page SMCN #77-1 bonded-axle change notice, three structural-repair replacement pages marked Temporary Change 1, dated September 5, 1977, and two electrical-load chart pages marked Change 5. These pages are already included in the file’s total; they are not additional manuals.