Piper Pitch Trim Service Manual PDF

DESCRIPTION

Ensure precise flight control and safety with the official Piper Pitch Trim Service Manual. This comprehensive technical reference (Part No. 753-771) provides factory-authorized procedures for maintaining, troubleshooting, and repairing all Electric Pitch Trim Systems used across the Piper fleet.

From legacy P.E.T. (Piper Electric Trim) systems to M.E.T. (Manual Electric Trim) and advanced AltiMatic AutoPilot integrations, this manual covers every mechanical and electrical aspect of the pitch trim assembly. It is an indispensable resource for A&P mechanics and avionics technicians working on Cherokee, Comanche, Aztec, Navajo, and Seneca aircraft.

Manual Features & System Coverage

The manual is divided into four major parts, covering specific system generations and sensor types:

Part I: P.E.T. (Piper Electric Trim) Systems

• Systems Covered: P.E.T.-1 Manual, P.E.T.-1 Automatic, P.E.T.-2 Automatic.

• Key Procedures:

  • Trim Servo Clutch Clearance Adjustment.

  • Clutch Solenoid Coil Adjustment.

  • Servo Selector Switch & Pitch AutoPilot Switch Adjustment.

  • Trim Sensor Centering: Detailed steps for Plate Type and Pendulous Type sensors.

  • Stop Sensor: Ground adjustment for Electric Trim Stop Sensor Assembly.

Part II: AltiMatic III, IIIB & IIIB-1 Electric Trim Systems

• Theory of Operation: Understanding automatic trim during autopilot engagement.

• Maintenance: Removal and installation of servos and amplifiers for PA-31, PA-32, and PA-34.

• Adjustments: Specific clutch tension settings and operational flight checks.

Part III: M.E.T. (Manual Electric Trim) Systems

• Application: For aircraft without autopilots (PA-23, PA-24, PA-30, PA-34, etc.).

• Components: Sliding switch and rocker switch maintenance on control wheels.

• Testing: Servo motor continuity tests and current drain checks.

Part IV: III Series Electric Trim (Dual Contact Sensor)

• Advanced Systems: Dual contact type trim sensor theory and adjustment.

• Troubleshooting: Diagnostic steps for trim amplifier and servo interaction.

Technical Content Breakdown

• Removal & Installation: Step-by-step guides for Trim Servos, Amplifiers, and Sensors located in the aft baggage compartment or fuselage.

• Troubleshooting: Comprehensive logic trees for “No Operation,” “Runaway Trim,” and Intermittent faults.

• Schematics & Wiring: Full fold-out style diagrams for:

  • P.E.T.-1 & P.E.T.-2 Schematics.

  • AltiMatic II, III, & IIIB Interconnects.

  • Trim Servo Motor Windings & Pinouts (14V & 28V systems).

• Adjustment Tables:

  • Cable Tension Specifications (e.g., PA-23 Stabilator Trim: 10 lbs ± 20%).

  • Clutch Slip Torque Values.

File Details

A runaway trim or a stuck servo is a pilot’s nightmare—ensure your aircraft’s rigging is flawless. Download the Piper Pitch Trim Service Manual today and get the factory-correct tension data and wiring diagrams you need to keep your electric trim system flying safely and smoothly!