Maintenance Manual STEMME S10-VT
Date of Issue: Dec. 19, 1997
Page: 5-8
Amendment No.: 23
Date: Jan. 29, 2015
A4011121_B23.doc
Doc. No. A40-11-121
5.3.4 Unscheduled Maintenance
Airworthiness Directives and Service Bulletins
In addition to scheduled maintenance described above, the need for special inspections and additional
maintenance may arise. Norma
lly, these situations will be publicized with a manufacturer’s Service Bulletin
(SB) or an Airworthiness Directive (AD) published by the responsible authority (e.g. EASA / FAA). Such
notices typically include a deadline to complete the required actions.
Compliance with Airworthiness Directives is mandatory.
STEMME strongly recommends that owners and operators, as a matter of prudence and flight safety, fully
and promptly comply with all relevant Service Bulletins (except Service Bulletins classified as “optional”).
Abnormal Operations
Abnormal airplane operations require special maintenance checks. Unscheduled checks following overweight
or hard landings, over-speed flight, severe air turbulence, lightning strike, foreign-object damage, and high
drag or side loads due to ground handling should be performed by an authorized maintenance person. The
inspector must conduct the relevant section 5.4 Annual Inspection of the potentially damaged components
and systems, e.g. landing gear, control surfaces, tail boom, empennage, etc. as appropriate and needed to
assure airworthy condition of the aircraft.
In any case of doubt concerning the condition and possible unrevealed damage, the owner or operator is
advised to contact the manufacturer or another appropriately approved maintenance person specialized on
diagnosing and repairing the affected type of components or systems.
Unscheduled Maintenance for Propeller Assembly, Engine Drive Section, and Front Gear Box
Components
An unscheduled inspection, overhaul, repair, or replacement is mandatory following each case of:
Sudden Stop or any Impact (possible ground touch) of the Propeller that reduces engine rpm, or
Failure to perform the periodic inspections specified in the Maintenance Manual.
If the inspection of the propeller indicates detectable damage beyond mere cosmetic distress to the propeller,
whether by ground contact, bird strike, stone strike or other impact, a qualified and authorized maintenance
person shall determine the extent of the damage.
For any damage which requires a Major Repair, the manufacturer or its approved agency must determine
which parts of the complete drive system are affected and require repair (if practicable), overhaul, rebuilding,
or replacement. See detailed guidance for evaluating impact damage to the Propeller in section 5.5.2 below.
5.3.5 Special Conditions and Cautionary Notice
Airplanes operated with high take-off/landing frequency or engaged in flight school use will likely need more
frequent inspections.
In addition, more frequent inspections and maintenance will be indicated for:
airplanes that are either stored or operated under other conditions than normal,
airplanes stored or operated in hot or humid tropical conditions,
airplanes stored or operated in cold or damp climates, and
airplanes stored or operated in extreme temperature or in arid conditions, etc.
