1969–1976 Cessna 150, F150, A150 & FA150 Aircraft Service Manual (P/N D971C3-RAND-1600-7/75)

Cessna's 1969–1976 150 Series Service Manual (document reference D971C3-13) covers the 150, Reims F150, A150 Aerobat, and Reims FA150 Aerobat, including Standard, Trainer, Commuter, and Commuter II versions. This Change 3 edition is dated June 15, 1975, and includes the October 18, 1977 Temporary Change 1 engine-data page.

• Airframe servicing: Ground handling, hoisting, jacking, leveling, storage, lubrication charts, inspection schedules, and Cessna Progressive Care program guidance.

• Landing gear and brakes: Flat and tubular main gear service, Cleveland and McCauley wheel repair, nose-strut and shimmy dampener servicing, and hydraulic brake bleeding.

• Flight controls: Aileron, flap, elevator, trim-tab, and rudder troubleshooting and rigging, including trim-actuator disassembly, inspection, and reassembly.

• Powerplant service: Engine removal and installation, carburetor adjustments, magneto-to-engine timing, exhaust inspection, and McCauley propeller and spinner installation.

• Instruments and electrical systems: Pitot-static leak tests, vacuum-system diagnosis, fuel-transmitter calibration, battery and alternator troubleshooting, and system-specific wiring diagrams.

• Structural repair: Damage assessment, skin and spar repairs, control-surface balancing, and exterior painting material and compatibility guidance.

Written for aircraft mechanics, this manual provides reference information for experienced personnel and step-by-step procedures for less experienced mechanics.

Airframe Service and Flight-Control Rigging

The fuselage, wings, and empennage sections cover component removal and installation, with separate information for cabin doors, windows, seats, and harnesses. Fuselage station diagrams and jacking and leveling views support component location and aircraft positioning.

Daily servicing guidance and 50-, 100-, and 200-hour inspection charts are accompanied by special inspection requirements. Lubrication information distinguishes flap-actuator configurations by serial range and modification status, including SK150-37B and SK150-41.

Flight-control sections address cable routing, bellcranks, pulleys, travel checks, and rigging. The flap chapter distinguishes early freewheeling actuators from installations with motor shutoff at both travel limits, helping mechanics select the applicable checks before adjusting the system.

The wing-adjustment section warns that mishandling the eccentric attachment bushings can misalign their bolt holes and damage the bolt hole in the wing spar.

Landing Gear, Wheels, and Hydraulic Brakes

Separate procedures distinguish flat spring-steel gear from tubular gear. Wheel service also separates Cleveland assemblies from McCauley aluminum- and steel-flange configurations, with a dedicated fastener-torque chart.

Main Wheel Alignment illustrations accompany the alignment checks; tubular-gear camber and toe-in are nonadjustable. Nose-gear coverage extends to shock-strut disassembly, torque links, steering rods, and shimmy dampener repair. Brake sections cover master cylinders, lining replacement, and bleeding.

For tubular-gear axles bonded with EC2216, the removal notes explain why heating the bond ages the aluminum axle and requires axle replacement.

Engine, Fuel System, and Propeller Service

Engine troubleshooting charts address starting problems, rough running, low power, and oil-pressure faults. Related sections cover engine mounts, the external oil filter, induction components, throttle and mixture rigging, and the Engine Oil Schematic.

The gravity-feed fuel-system chapter covers tanks, vent checks, shut-off valve replacement, primer components, and fuel-strainer disassembly. Propeller installation details distinguish the different spinner and bulkhead arrangements.

Overhaul limits: Internal engine repair and overhaul, carburetor overhaul, and detailed propeller repair require the respective manufacturer's publications. Slick magneto coverage concerns installation and timing to the engine; the sealed units are not field-overhauled.

Instrument Diagnosis, Electrical Circuits, and Structural Repairs

Static Test Equipment illustrations accompany leak testing. Vacuum-system troubleshooting covers the pump, relief valve, and central air filters. Instrument coverage focuses on system faults and replacement; internal instrument repairs belong with instrument specialists.

Electrical sections include charging-system and lighting fault charts. The wiring chapter separates earlier circuits from the 1976 installations, including electric-flap diagrams. Optional wing-leveler rigging is covered. Nav-O-Matic autopilots and electronic communications and navigation equipment require separate manuals.

Structural repair coverage addresses skins, ribs, spars, landing-gear bulkheads, and hard-landing damage. Control Surface Balancing illustrations cover checks following repair or painting, alongside repair-jig information and exterior finish guidance.

Aircraft service, structural adjustments, and repairs must be performed by appropriately qualified aviation personnel, with particular care around the propeller and ignition system.

A Sample of Control-Cable and Trim Inspection Data

These are two examples of the rigging and inspection specifications included in the manual.

Aileron carry-through cable tension is specified at 40 ± 10 lb at the average temperature for the area.

With the elevators and trim tab neutral, maximum trim-tab free play is 0.112 inch total up-and-down movement measured at the trailing edge.

Bookmarked PDF and Wiring-Sheet Readability

Section access and diagram detail: Embedded bookmarks link the introductory material and system sections. Manual pages do not support PDF text search. Small wiring labels require zooming; some tiny handwritten notes and crowded table entries remain difficult to distinguish.

Supplied as one printable, 358-page PDF. The total includes the cover, preliminary material, revision inserts, 23 blank pages, and the single Temporary Change 1 replacement page; these pages are already included in the total.