Maintenance

Question 1

Maintenance categories

Answer 1

preventative
corrective
predictive

Question 2

Corrective

Answer 2

fault or defect which requires immediate repair or rectification
unplanned event may disrupt flight operations
may invoke financial and commercial penalties

Question 3

Preventative

Answer 3

to ensure continued airworthiness or aircraft through its life
can be planned in advance to fit with flight operations
carried out in accordance with the Approved Maintenance Programme(AMP)

Question 4

AMP

Answer 4

compilation starts with aircraft equipment manfuacturers, operators and regulators forming a Maintenance Review Board working group
working group submit report to regulator for approval
operators use report as a basis for a working schedule. This has to be approved by regulator

Question 5

Legal aspect

Answer 5

operators are licensed to maintain aircraft in accordance with AMP
CAA monitors operators to ensure compliance
If operators are found guilty of non-compliance, they can have their license withdrawn

Question 6

MSG 1

Answer 6

introduced after the B747
took into account economic factors as well as safety and airworthiness
introduced reliability centred maintenance to form basis of AMP

Question 7

RCM aims

Answer 7

preserve functionality
identify failure modes that can degrade functionality
prioritise functionality
identify applicable and effective maintenance action

Question 8

MSG 3

Answer 8

introduced a top-down approach which identifies significant items that require preventative maintenance
introduced during the formation of B757-767 schedules

Question 9

Define maintenance significant items

Answer 9

items which could affect safety and/or are undetectable during operations and/or could have a significant operational economic impact

Question 10

Define structural significant items

Answer 10

items which carry ground and flight loads.

failure would affect structural integrity and safety of aircraft

Question 11

Maintenance processes

Answer 11

hard time
on-condition
condition-monitored

Question 12

Hard time

Answer 12

critical items have a finite life and are replaced regardless of condition at the end of their life
life is based on the most fitting criteria such as flying hours, engine hours, number of landings
uneconomical and has been shown to cause and increase fault activity

Question 13

On-condition

Answer 13

critical flaws are examined and/or tested and checked against a reference condition
if the item is at an acceptable standard and not replaced, it is subjected to a further inspection at a later stage
reduced system disruption, more economic maintenance

Question 14

Predictive maintenance

Answer 14

aim: just in time maintenance to provide airworthiness with economical benefits
process: conditioned monitored maintenance

Question 15

Condition-monitored

Answer 15

uses statistical analysis as a method of indicating continued airworthiness of aircraft systems and structures
integrated with hard time and on-condition
built on fail safe and multiple redundancy design concepts

Question 16

ETOPS- extended range twin engined operations

Requirements for ETOPS certification

Answer 16

engine health monitoring
pre-departure service check
basic and multi system maintenance
event orientated reliability programme