annually or when there is a possibility of mechanical
damage. If any damage is found, it must be repaired
Static Grounding of Aircraft. All aircraft parked
in a hangar must be grounded (earthed) at all times.
Static Grounding of Ground Support Equipment .
Ground support equipment in a hangar must be
grounded at all times when in contact with the aircraft
being worked on.
Emergency Evacuation of Aircraft from Hangar .
A plan for the emergency evacuation of aircraft from a
hangar must be established and implemented by the
maintenance officer using the expertise of the aviation
safety officer and other applicable elements. Care
Jacking and Hoisting. General instructions for
lacking and hoisting are explained in the following
paragraphs. For specific instructions on a particular
aircraft, refer to the applicable maintenance manual.
Jacking. Use the following procedures for in
and out of hangar jacking:
Do not stand, sit, or lie inside or on
aircraft during raising or lowering operations.
Ensure that all stress panels are installed
Disengage aircraft brakes and remove
Place all jacks on a level surface so that
an imaginary line drawn through any 2 feet of jack will
be parallel to fuselage or load to be jacked. Jack only at
specified jack points.
Position auxiliary supports as necessary
to adequately prevent accidental injury to personnel or
damage to aircraft.
Place tail stands under all aircraft
equipped with tricycle landing gear.
Secure a ground-supported weight to
tail of conventional gear aircraft.
When tail wheel is to remain in
contact with ground, lock it after
Leave tail wheel free to roll fore and
aft during jacking and lowering
Operate all jacks simultaneously, both up
and down, to prevent binding of aircraft struts. Binding
may be corrected by tapping strut with a rawhide mallet
or kicking tire.
Ensure that there is sufficient clearance
above aircraft to complete desired operation.
Aircraft on jacks shall be so labeled,
and access restricted to prevent
injury to personnel.
Unauthorized persons will not be in,
on or under aircraft supported by
jacks. Areas shall be restricted by
proper warning signs and barriers to
preclude entry into the area.
The use of auxiliary supports is
recommended, but not required, as
standard jacks are designed to
withstand all vertical loads. When
several people are to be working on
the aircraft, auxiliary supports are
Do not jack aircraft when wind velocity is
greater than maximum amount specified in applicable
maintenance manual. When applicable maintenance
manual does not list a maximum wind velocity, a
velocity of 15 miles per hour will be considered
2-10 Change 3
must be taken to ensure the safe evacution of as many
aircraft as possible in an emergency.