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S8C15 - AIRCRAFT COMPASS SYSTEM CALIBRATION AND COMPASS SWING SITES

Table of Contents

INTRODUCTION

RESPONSIBILITIES

AIRCRAFT COMPASS CALIBRATION REQUIREMENTS

Assessment of Aircraft Compass System Calibrations

COMPASS SWING SITE REQUIREMENTS

INTRODUCTION

1. The accurate calibration of an aircraft compass system is essential to flight safety and to the effective operation of other integrated systems. The accuracy of the aircraft compass system depends primarily on the characteristics of the chosen compass swing site and external influences introduced into the system.

2. This chapter prescribes the Approved Maintenance Organisation (AMO) responsibilities and procedures to be followed when calibrating aircraft compass systems and managing compass swing sites.

RESPONSIBILITIES

3. The Senior Maintenance Manager (SMM) or delegate is responsible for ensuring that:

  1. Aircraft compass systems are to be calibrated in accordance with paragraph 5.
  2. Appropriately qualified and authorised personnel perform compass system calibrations in accordance with the applicable authorised maintenance data.
  3. Compass swing site Managers for the compass swing sites normally used by the AMO are informed of any specific and special aircraft requirements, eg paint markings or higher than normal calibration tolerances.

4. The compass swing site Manager or delegate is responsible for ensuring that:

  1. Compass swing sites are managed in accordance with paragraph 7.
  2. The requirements of the site users are addressed when compass swing sites are surveyed and marked.

AIRCRAFT COMPASS CALIBRATION REQUIREMENTS

5. Aircraft compass calibrations for all aircraft must be in accordance with the responsible System Program Office (SPO) authorised maintenance data. Furthermore, AAP 7090.001–99 - Avionics Engineering General Instructions Instruction 3—Calibration of Aircraft Compass Systems details the requirements for calibration accuracy limits, forms and Fourier analysis requirements to be used when calibrating aircraft compass systems.

Assessment of Aircraft Compass System Calibrations

6. The results of all aircraft compass system calibrations and Fourier analysis are to be checked and signed by the SMM or delegate. The serviceability of the aircraft compass system is then to be entered into the recording and certification system as required by AAP 7090.001–99 Instruction 3 or other authorised maintenance data.

COMPASS SWING SITE REQUIREMENTS

7. Aircraft compass swing sites must be checked and surveyed in accordance with AAP 7090.001–99 Instruction 24—Management and Maintenance of ADF Aircraft Compass Swing Sites.

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