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can significantly impair pilot performance.
Again, consult with an Aviation Medical
Examiner to understand the affects of medication
before flying.
g. Fatigue. Fly only when healthy, fit, and
alert. Mental and physical fatigue will generally slow
down a pilot’s reaction time, affect decision making,
and attention span. Lack of sleep is the most common
cause of fatigue, but family and business problems
can create mental fatigue which can have the same
effects on the pilot as lack of sleep.
h. Flicker Vertigo. Light, when flashing at a
frequency between 4 to 29 cycles per second, can
cause a dangerous physiological condition in some
people called flicker vertigo. These conditions range
from nausea and dizziness to unconsciousness, or
even reactions similar to an epileptic fit. When heading
into the sun, a propeller cutting the light may
produce this flashing effect. Avoid flicker vertigo,
especially when the engine is throttled back for landing.
To alleviate this when the propeller is causing
the problem, frequently change engine revolutions
per minute (rpm). When flying at night and the rotating
beacon is creating flicker vertigo, turn it off.
i. Underwater Diving. Never fly immediately
after SCUBA diving. Always allow 24 hours to
elapse before flying as a pilot or a passenger in order
to give the body sufficient time to rid itself of excessive
nitrogen absorbed during diving.
j. Stress. Stress from the pressures of a job
and everyday living can impair a pilot’s performance,
often in subtle ways. A test pilot may further
increase the stress level by setting unreasonable test
flying schedules in order to meet an arbitrary ‘‘be
done by date.’’ Stress also may impair judgement,
inducing the pilot to take unwarranted risks, such
as flying into deteriorating weather conditions or flying
when fatigued to meet a self imposed deadline.
9
5/24/95 AC 90-89A
SECTION 6. TRANSPORTING THE AIRCRAFT TO THE AIRPORT
‘‘Best laid plans of mice and men are often stuck in traffic.’’ Ben Owen, EAA Executive Director (1994)
1. OBJECTIVE. To reduce damaging the aircraft
in transit. The following suggestions may prevent
this from happening:
a. Use a truck or flat bed truck/trailer large
enough to accommodate the aircraft and the additional
support equipment.
b. If the aircraft wings are removable, build
padded jigs, cradles, or fixtures to hold and support
them during the trip to the airport.
c. Secure the fixtures to the truck/trailer, then
secure the wings to the fixture.
d. Use two or more ropes at each tie down
point.
e. Use heavy moving pads used for household
moves to protect wings and fuselage. Most rent-atruck
firms offer them for rental.
f. During the planning stage, obtain
applicable permits and follow the local ordinances
for transporting an oversized load. Ask the local
police if they can provide an escort to the airport.
g. Brief the moving crew thoroughly before
loading and unloading the aircraft.
h. Ensure the designated driver has recent
experience driving a truck/trailer and is familiar with
the roads to the airport.
10
AC 90-89A 5/24/95
SECTION 7. ASSEMBLY AND AIRWORTHINESS INSPECTION
‘‘Complacency is one of the major causes of accidents, no matter how well things are going, something
can go wrong’’ Art Scholl
1. OBJECTIVE. To determine the airworthiness
of the aircraft and its systems.
2. GENERAL.
a. If the aircraft must be reassembled after
being moved to the airport -- take time to do so
carefully. This is a critical event because mistakes
can easily be made due to the builder’s preoccupation
with the impending first flight of the aircraft. One
of the most common and deadly mistakes is to
reverse the rigging on the ailerons. To prevent errors
in reassembling the aircraft, follow the designer’s
or kit manufacturer’s instructions, or use a written
check list specifically designed as part of the
FLIGHT TEST PLAN. At the completion of each
major operation, have another expert check the work.
b. When the aircraft is reassembled, perform
a pre-flight ‘‘fitness inspection.’’ This inspection
should be similar in scope and detail to an annual
inspection. The fitness inspection should be accomplished
even if the aircraft has just been issued a
special airworthiness certificate by the FAA. Even
if a builder was 99 percent perfect and performed
10,000 tasks building the aircraft, there would still
　
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