● AD (Airworthiness Directive) – by
Reviewer: Aircraft Maintenance authority, mandatory to correct
unsafe conditions.
Publications, Forms & Records
SB may become AD.
Importance
● AC (Advisory Circular) – by authority,
● Safety – to ensure the maintenance guidance & best practices (not
is performed correctly to prevent mandatory).
accidents.
Maintenance Records
● Compliance – meets national and
international aviation regulations. ● Aircraft Logbook – history of flight
● Airworthiness – confirms the aircraft (FH: flight hours, FC: flight cycles),
is safe and fit to fly. fuel, discrepancies.
● Efficiency – procedure that saves ● Engine Logbook – engine hours,
time and reduces errors. cycles, oil, inspections.
● Accountability – maintains a ● Airframe Logbook – aircraft hours,
verifiable history of all maintenance cycles, repairs, mods.
work. ● Component Logbook – life and
maintenance record of life-limited or
Maintenance Forms & Record
serialized parts.
● Logbook – aircraft history ● Task Card / Work Package –
(documents flight hours, step-by-step maintenance task
maintenance and malfunctions) record.
● Journey Log – per flight record (fuel, ● AD/SB Compliance Record – proof
duration, incidents). ADs & SBs applied (no., date,
● Maintenance Release – certifies method).
airworthiness after maintenance.
● Work Order/Job Card – authorizes &
tracks specific tasks.
● Discrepancy Report – records defect
+ corrective action.
● Material Request Form – request for
Technical Documentation
parts/tools.
● CRS (Certificate of Release to Manufacturer Manuals:
Service) – declares
aircraft/component fit for ● AMM (Aircraft Maintenance Manual)
airworthiness standard. – detailed system procedures,
inspections, servicing, repair,
Service Publications troubleshooting.
● SRM (Structural Repair Manual) –
● SB (Service Bulletin) – by
guidelines for repairing damage.
manufacturer, recommended only
(safety, upgrades, fixes).
, ● IPC (Illustrated Parts Catalog) – ● Transit – between flights, short
diagrams + part numbers. inspection.
● WDM (Wiring Diagram Manual) – full ● Daily Check – every 24–48 hrs,
electrical wiring layout. fluids + basic systems.
● TSM (Troubleshooting Manual) –
systematic fault identification Base Maintenance (hangar)
procedures.
● FIM (Fault Isolation Manual) – ● A-Check – ~500 FH / 2–3 months,
step-by-step fault isolation. light systems/fluids.
● B-Check – ~6–8 months, deeper
Operator Manuals: checks (often merged with A/C).
● C-Check – 20–24 months /
● MCM (Maintenance Control Manual) 5,000–6,000 FH, major systems +
– airline’s maintenance policies. structures.
● MEL (Minimum Equipment List) – ● D-Check (Heavy Maintenance Visit)
allowable inoperative items. – 6–10 years, complete teardown &
● CDL (Configuration Deviation List) – overhaul.
acceptable missing items.
● Key Factors Affecting Schedule
Others:
● FH (Flight Hours) – total airborne
SIL (Service Information Letter) — provides time.
general info or updates (advisory). ● FC (Flight Cycles) – takeoff +
landing pressurization cycles.
SL (Service Letter) — manufacturer ● Calendar Time – elapsed
guidance on minor months/years.
improvements/clarifications. ● Manufacturer’s Recommendations –
baseline program.
EB (Engineering Bulletin) — technical ● Regulations – FAA/EASA ADs.
engineering updates from the manufacturer. ● Environment – salty, hot, humid ops.
● Age/Type – older aircraft need more
Revision Control
frequent checks.
● Revisions every 3–6 months.
● Only the latest version is valid.
● Check: revision status, temp
revisions, effectiveness, validity.
Types of Checks
Line Maintenance (on ramp)
● Pre-Flight – quick walk-around
before each flight.
Reviewer: Aircraft Maintenance authority, mandatory to correct
unsafe conditions.
Publications, Forms & Records
SB may become AD.
Importance
● AC (Advisory Circular) – by authority,
● Safety – to ensure the maintenance guidance & best practices (not
is performed correctly to prevent mandatory).
accidents.
Maintenance Records
● Compliance – meets national and
international aviation regulations. ● Aircraft Logbook – history of flight
● Airworthiness – confirms the aircraft (FH: flight hours, FC: flight cycles),
is safe and fit to fly. fuel, discrepancies.
● Efficiency – procedure that saves ● Engine Logbook – engine hours,
time and reduces errors. cycles, oil, inspections.
● Accountability – maintains a ● Airframe Logbook – aircraft hours,
verifiable history of all maintenance cycles, repairs, mods.
work. ● Component Logbook – life and
maintenance record of life-limited or
Maintenance Forms & Record
serialized parts.
● Logbook – aircraft history ● Task Card / Work Package –
(documents flight hours, step-by-step maintenance task
maintenance and malfunctions) record.
● Journey Log – per flight record (fuel, ● AD/SB Compliance Record – proof
duration, incidents). ADs & SBs applied (no., date,
● Maintenance Release – certifies method).
airworthiness after maintenance.
● Work Order/Job Card – authorizes &
tracks specific tasks.
● Discrepancy Report – records defect
+ corrective action.
● Material Request Form – request for
Technical Documentation
parts/tools.
● CRS (Certificate of Release to Manufacturer Manuals:
Service) – declares
aircraft/component fit for ● AMM (Aircraft Maintenance Manual)
airworthiness standard. – detailed system procedures,
inspections, servicing, repair,
Service Publications troubleshooting.
● SRM (Structural Repair Manual) –
● SB (Service Bulletin) – by
guidelines for repairing damage.
manufacturer, recommended only
(safety, upgrades, fixes).
, ● IPC (Illustrated Parts Catalog) – ● Transit – between flights, short
diagrams + part numbers. inspection.
● WDM (Wiring Diagram Manual) – full ● Daily Check – every 24–48 hrs,
electrical wiring layout. fluids + basic systems.
● TSM (Troubleshooting Manual) –
systematic fault identification Base Maintenance (hangar)
procedures.
● FIM (Fault Isolation Manual) – ● A-Check – ~500 FH / 2–3 months,
step-by-step fault isolation. light systems/fluids.
● B-Check – ~6–8 months, deeper
Operator Manuals: checks (often merged with A/C).
● C-Check – 20–24 months /
● MCM (Maintenance Control Manual) 5,000–6,000 FH, major systems +
– airline’s maintenance policies. structures.
● MEL (Minimum Equipment List) – ● D-Check (Heavy Maintenance Visit)
allowable inoperative items. – 6–10 years, complete teardown &
● CDL (Configuration Deviation List) – overhaul.
acceptable missing items.
● Key Factors Affecting Schedule
Others:
● FH (Flight Hours) – total airborne
SIL (Service Information Letter) — provides time.
general info or updates (advisory). ● FC (Flight Cycles) – takeoff +
landing pressurization cycles.
SL (Service Letter) — manufacturer ● Calendar Time – elapsed
guidance on minor months/years.
improvements/clarifications. ● Manufacturer’s Recommendations –
baseline program.
EB (Engineering Bulletin) — technical ● Regulations – FAA/EASA ADs.
engineering updates from the manufacturer. ● Environment – salty, hot, humid ops.
● Age/Type – older aircraft need more
Revision Control
frequent checks.
● Revisions every 3–6 months.
● Only the latest version is valid.
● Check: revision status, temp
revisions, effectiveness, validity.
Types of Checks
Line Maintenance (on ramp)
● Pre-Flight – quick walk-around
before each flight.
