Aircraft Technical Logbook

What is the Aircraft Technical Logbook?

The aircraft technical logbook, sometimes called the 'tech log,' is a mandatory record-keeping system for every commercial aircraft. It contains details of each flight, any technical defects, rectification actions, and scheduled or unscheduled maintenance. The technical logbook is distinct from the journey logbook, which focuses on operational details like crew and flight times.

Technical Logbook Requirements

• The technical logbook must be carried on board for international flights, as required by ICAO standards and national regulations.
• Entries must be made for each flight, noting flight times, defects, and maintenance actions.
• Only authorised personnel (typically licensed engineers or the pilot-in-command) may make or certify entries regarding maintenance or defect rectification.
• The logbook must be preserved for a specified period after the last entry, often two years or more, depending on national rules.

Aircraft Logbook Contents

Typical sections include:

• Aircraft identification and registration
• Flight date, departure and arrival aerodromes, and flight times
• Technical defects reported by crew
• Maintenance actions taken, including release-to-service statements
• Deferred defects and their control
• Signatures of responsible personnel

Operational Importance

Before each flight, the pilot-in-command must review the technical logbook to ensure the aircraft is airworthy, all defects are addressed, and required maintenance has been completed. Any open or deferred defects must be within allowable limits, and the aircraft must be released to service by authorised personnel.

ICAO and EASA Context

The technical logbook is part of the documentation required under ICAO Annex 6 and EASA regulations. It is a key tool for demonstrating compliance with airworthiness and maintenance standards, and for supporting continued safe operation of the aircraft.