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Maintenance
includes monitoring, servicing and reconditioning of aircraft
components as specified in the various manuals
Preventive maintenance
simple or minor preservation
operations and replacement of small standard parts, not
involving complex assembly operations. 14 CFR Part 43
Corrective maintenance
consist of all operations that
are performed after detection of a failure or anomaly in
order to re-establish the initial operating condition
Progressive maintenance
allows aircraft to undergo
FAA and manufacturer inspections continually, as
opposed to one all-encompossing check
Special flight permit
is a special airworthiness certificate
authorizing operation of an aircraft that does not currently meet
applicable airworthiness requirements but is safe for a specific flight
Hard time Maintenance
primary maintenance process
under which an item must be removed form service at or
before a scheduled specified
Service Life Limit (SLL)
airworthiness limitation
Operation Time Limit (OTL)
NOT an airworthiness limitation
Time Between Overhaul (TBO)
assigned to a complete assembly. The interval corresponds to the operating time permitted before an overhaul is performed in a specialized shop
On-Condition Maintenance
maintenance process
restricted to components in which determination of
continued airworthiness can be made by visual checks,
measurements, test or other means without a tear-down
inspection or overhaul
Condition Monitoring Maintenance
component is subject to condition monitoring only after its failure (which has no impact on flight safety) has been detected
Rotable
needs periodic replacement
Repairable
usually repaired then returned to
service as repaired/overhauled or even “as
new” condition
Expendable
usually just thrown away at the
end of its usable life
Consumable
rendered unsuitable for reuse
when its installed and used
Limits
component or maintenance operation can be subject to one
or more limits expressed
- Flight hours (counted from take-off to landing)
- Calendar time (in days, in months)
- Cycles (one takeoff & landing without considering the
flight time)
Type Certificate (TC) holder
- must prepare and submit for approval
to the relevant airworthiness authorities the initial minimum sched.
Maintenance Review Board Report (MRBR)
- used as a framework around wich each air carrier develops its own individual maintenance program
Certification Maintenance Requirement (CMR)
- is a required periodic task, established during the design certification of the airplane as an operating limitation of the certificate
Airworthiness Limitations (AL)
- regulatory approved means of
introducing certain inspections, or maintenance practices, to prevent
problems with certain systems
OPC = Operational check
- a failure finding task to determine if an item is fulfilling its intended purposes
VCK = Visual Check
A visual failure finding task through
observation to determine if an item is fulfilling its intended purpose
GVI = Inspection - General visual
A visual examination that will
detect obvious unsatisfactory conditions
FNC = Functional check
‐ A quantitative check to determine if one
or more functions of an item performs within specified limits.
RST = Restoration
‐ Reworking, replacement of parts or cleaning
necessary to return an item to a specific standard.
Scheduled Maintenance
- performed at regular intervals
- Includes 100hrs inspections, annuals inspections and
progressive inspections
Preflight/post flight inspection
- Pilots required to follow checklist contained within the
pilot’s operating handbook
Annual Inspection
- performed once every 12 calendar months
100 hour inspection
- A certified A&P Mechanic can conduct a
100-hour inspection
Progressive Inspection
- Inspection that allows an aircraft to be
inspected progressively.
Continuous inspection
- programs are similar to progressive
inspection programs, except that they apply to large or
turbine-powered aircraft and are therefore more complicated.
Altimeter and Transponder Inspections
Overweight or Hard Landing
- This inspection is performed any
time an aircraft has experienced an overweight, or unusually hard
landing.
Severe Turbulence Inspection
- Severe turbulence exerts
substantial stress on all areas of an aircraft structure.
Hot Starts, Stackfires, Sudden Stoppage Inspections
- Inspection
of an engine after a hot start, stack fire, or sudden stoppage should
be in accordance with the manufacturer's instructions.
RECURRING INSPECTIONS
- At times, an airframe component,
engine, or accessory requires a recurring inspection at specified
intervals.
Unscheduled Maintenance
- It can occur after the pilot finds a
problem during the preflight inspection, as the result of an in-flight
malfunction, or as the result of problems found during 100-
hour, annual, and progressive inspections.
AIRCRAFT MAINTENANCE CHECKS
- refer to the periodic inspections every commercial
A Check
- This type of check is performed every 400–600 flight
hours or 200–300 cycles (takeoff and landing = 1 aircraft
cycle).
- approximately 50–70 man-hours. requires an aircraft to
remain on the ground for at least 10 hours
B Check
- This check is conducted every six to eight months, and it
requires approximately 160–180 man-hours, depending
on the type of aircraft and its actual condition.
- conducted at an airport hangar, usually takes one to three
days to complete.
C Check
- Performed every 20–24 months or a specific number of
manufacturer-defined flight hours, the C Check is more
extensive than the A and B checks. It also involves
inspection of a large number of components. at least two
weeks and up to 6,000 man-hours
3C Check
- Also known as Intermediate Layover (IL)
- refers to light maintenance checks for corrosion or
deterioration
- 3C check as an opportunity to perform cabin upgrades
D Check
- The D check is the most comprehensive check designed
for aircraft. Also called “heavy maintenance visit,” the D
check is conducted every 6–10 years. take up to two
months, approximately 50,000 man-hours
Note 
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