AIRCRAFT TECHNICAL LOGBOOK
Instructor: Engr. Ysmael I. Caballero
PRC No. 001016
Training Date: July 22, 2023 | 1000H – 1700H
A.K.A “TECH-LOG” or “Logbook”
AIRCRAFT DIARY
The Aircraft Technical Log (ATL) is the primary source for technical and
operational data on each flight that occurs on an aircraft. This data includes
defects and malfunctions, block times and fuel consumption. It also records
all maintenance carried out on an aircraft between scheduled base
maintenance visits.
Aircraft logbooks are documents containing records of complied
maintenance checks, component changes, modifications, technical
publication accomplishment and corrections of discrepancies made on the
aircraft and/or components. [PCAR 9.4.1.8 (a)]
The information contained thereto is essential in monitoring, controlling and
scheduling of maintenance activities. For this reason, it is mandatory that the
information being recorded in the Aircraft Logbooks be accurate and up-to-
date and that proper and timely routing of log sheets to concerned
departments be done on regular basis. Any subsequent amendment to the
Aircraft Logbooks shall be endorsed to the Authority for approval. [PCAR
9.4.1.8 (b)]
NOTE: Always check the aircraft registration on the front of the tech log
matches the aircraft registration – with some airlines having hundreds of
aircraft its important to make sure you’re looking at the right aircraft!
PILOT IN COMMAND:
1. Times when the aircraft take off and landed.
2. Any defect which may affects the airworthiness of the aircraft.
3. Other particulars in respect of the airworthiness or operation of the aircraft as the
Director General may require.
4. The arrival fuel state.
5. A Certificate of Release to Service for which the defects has been eliminated.
6. The quantities of fuel and oil uplifted, and the quantity available in each tank,or
combination of tanks, at the beginning of each flight.
7. The total hours of flying to determine the next inspection.
8. Provision for pre-flight and daily inspection signatures.
9. The times when ground de-icing was started and completed.
CERTIFYING STAFF (MAINTENANCE):
1. Time and date of the RTS
2. Information for defect rectification / maintenance action.
3. Deferred Defects Entries.
4. All maintenance activity carried out on the aircraft on ground.
All Logbook entries must be done accurately and shall contain the following information:
1. WHAT - Description of the discrepancy and the corresponding corrective action,
including the list of parts installed (if applicable)
2. HOW – Description of how the discrepancy was rectified. Personnel must indicate the
approved data reference
3. WHO – Indicate the name, signature, employee number or stamp of the personnel who
did the rectification. Note: When signing maintenance documents the following
methods are acceptable: 1. Signature over printed name 2. Signature over employee
number 3. Stamp Impression
4. WHEN – Indicate the date and time in Coordinated Universal Time (UTC) the discrepancy
was noted / corrected.
5. WHERE - Indicate the location where the task was performed
NOTE: [PCAR 9.3.1.5 (b)] - All entries must be done in all upper case letters (all CAPITAL)
using BLACK or BLUE ink ballpoint pen.
All Logbook entries must be done accurately and shall contain the following information:
1. WHAT - Description of the discrepancy and the corresponding corrective action,
including the list of parts installed (if applicable)
2. HOW – Description of how the discrepancy was rectified. Personnel must indicate the
approved data reference
3. WHO – Indicate the name, signature, employee number or stamp of the personnel who
did the rectification. Note: When signing maintenance documents the following
methods are acceptable: 1. Signature over printed name 2. Signature over employee
number 3. Stamp Impression
4. WHEN – Indicate the date and time in Coordinated Universal Time (UTC) the discrepancy
was noted / corrected.
5. WHERE - Indicate the location where the task was performed
NOTE: [PCAR 9.3.1.5 (b)] - All entries must be done in all upper case letters (all CAPITAL)
using BLACK or BLUE ink ballpoint pen.
DEFECT COLUMN - where the flight or ground
remarks are being entered either by cockpit
crew or authorized technical personnel.
Notes:
A. The personnel writing the flight or ground remark must
indicate his/her name and signature in the box labelled
“sign”.
B. Flight crew sometimes write up remarks for information to
the ground crew, i.e. Autoland practice/performance.
Authorized certifying staff shall close the log-sheet by
writing “noted”.
ACTION COLUMN - where the correction or
action taken to correct or address the
discrepancy will be entered. This information
will include the maintenance action done and
the corresponding approved data reference.
Note:
Only the Operator authorized personnel can certify in this
column.
Note:
All the provisions of ATL Handling are the same as the CDL
Handling except for the RTS. The CDL must not be used to
document Aircraft RTS.
A. For discrepancies or any maintenance action requiring
replacements and/or maintenance of aircraft system
components the CDL entry should be re-sequence to the
ATL and the original entry “Closed”.
B. Follow the normal ATL handling
Note:
All the provisions of ATL Handling are the same as the CDL
Handling except for the RTS. The CDL must not be used to
document Aircraft RTS.
A. For discrepancies or any maintenance action requiring
replacements and/or maintenance of aircraft system
components the CDL entry should be re-sequence to the
ATL and the original entry “Closed”.
B. Follow the normal ATL handling
AIRCRAFT TECHNICAL LOGBOOK (ATL)
◦ FLIGHT CREW AND CERTIFYING STAFF
CABIN DISCREPANCY LOGBOOK (CDL)
◦ CABIN CREW AND CERTIFYING STAFF
As a rule, there should only be three (3) ATL
Logbooks and (3) inside the cockpit:
1. The most recently spent ATL Logbook, NOTE: Old / Used –
up Aircraft Technical Logbook / CDL shall be retained in the
aircraft for a period of seven (7) days since the last log
sheet was completed. Logbook will be forwarded to
Production Control of subcontracted Aircraft Maintenance
Organization.
2. the currently being used ATL Logbook,
3. and a spare ATL Logbook.
Possible delay
AOG
Records and important information on the
aircraft is lost.
When ATL become lost/missing, the aircraft
becomes de facto Unairworthy, meaning it
can’t legally be flown.
SOLVING THE PAPER BASED ATL ISSUES…
Paper based logbook can be missing
Flight Crew has to enter the flight deck to know the aircraft
status
Maintenance wait for aircraft arrival to know the Pilot’s
Remarks
Browsing the Aircraft Defect History
1. Who is responsible for logging the information / actions
done on the aircraft?
2. Who is the only Authorized to Certify the Aircraft?
3. Give one possible scenario that might happen is you remove
the “current” ATL from the aircraft.
4. What logbook is used to report the defect on the Cabin?
