Basic set of tasks may be performed every —- hours
200
As flight hour increase, what happens to the tasks required
Increases
Explain A check
- performed approx every 500-800 flight hours (or 200-400 cycles)
- 20-50 man hours required (usually performed overnight at gate/hangar)
Explain a B check?
- performed approx every 4-6 months
- 150 man hours
- usually performed within 1-3 days within a hangar environment
Explain a C check?
- performed approximately every 20-24 months
- requires up to 6000 man hours
- usually performed in hangar (generally 1-2) weeks
Explain a D check?
- performed every 5 years
- 50000 man hours (can take up to 2 months in hangar facility)
On average, how many D checks does a aircraft undergo before it is retired
2-3
What are airworthiness directives (ADs)?
- they are issued to address unsafe conditions
Explain sensitive security airworthiness directives (SSAD)?
- is an AD issued or adopted by UK CAA that mandates certain corrective actions
- must be done on a ‘need to know’ basis
What is a service bulletin (SBs)?
- increases efficiency of aircraft by modifying certain aspects
Can SBs sometimes be mandatory by relevant airworthiness directive (AD)?
Yes
Explain a ‘alert SB’
- issued on matters that require urgent attention of the operator
Explain a Standard SB
- issued where the use of alert service bulletins is not required
Explain a engine conversion SB
- conversion service bulletins will be issued to provide operators with necessary information to convert engine models
Explain a service information (SIL)?
-Document used by manufacturers
- gives ‘useful information’ about their products which can enhance safety, reliability or reduce repetitive costs etc
What is an Illustrated Parts Catalogue (IPC)
- produced by aircraft manufacturer
- designed to allow engineer to identify replaceable components on the aircraft
What is a structural repair manual (SRM)
- contains information and specific instructions for the repair of primary and secondary structures of the aircraft
Explain the wiring diagram manual (WDM)
- documentation of all aspects of the wiring on the aircraft, engine, and components
The wiring diagram manual (WDM) is subdivided into 3 parts?
- aircraft schematic manual (ASM)
- aircraft wiring manual (AWM)
- aircraft wiring list (AWL)
Explain the component maintenance manuals (CMM)?
- contains information required for the maintenance, repair, and overhaul of aircraft components
Explain the Dispatch deviation list (DDL)?
- overall document, within that there are 2 ‘sub documents’ specifically the MEL and CDL
Who are ‘Block (pyramid)’ maintenance systems best suited to
- long haul carriers/older aircraft
What are E checks and who are they suitable for?
- Tasks are distributed equally but are conducted more frequently
- suitable for short haul/newer aircraft
What is considered a aircraft cycle
A take off and a landing
