Inspection And Checks Of Instrument And System - Piper Navajo Chieftain PA-31-350 Service Manual

NAVAJO CHIEFTAIN SERVICE MANUAL
10-7. INSPECTION AND CHECKS OF INSTRUMENTS AND SYSTEM. During the regular inspection
of
the airplane or whenever an instrument or instruments is changed or serviced, the following inspection and
checks should be made to the complete system:
a.
Inspect the pitot - static system for cleanliness, condition, security and operation per Advisory
Circular No. AC43-203A for aircraft operated in controlled airspace under IFR conditions. Aircraft
not
operated in controlled airspace should be tested per Advisory Circular AC43.13-lA, Section 4 of Chapter
16.
b.
Inspect the instruments for poor condition, mounting, markings, broken or loose and/or missing
knob, bent or missing pointers, and improper operation (where applicable).
c.
Check power-off indications of instrument pointers and warning flags for proper indication.
d.
Apply power and check for excessive mechanical noise, erratic or intermittent operation, failure
to indicate, sluggishness or indication of excessive friction. Note if the erection or warm-up
time is
excessive, caging functions are normal, and warning flags and indicating lights and test circuits are operable.
e.
Note operation of instruments during engine runup. Check for intermittent or improper
operation of any instrument.
f.
Inspect the complete system for general condition, apparent and obvious defects, insecurity of
attachments, tubing connections and pneumatic tubing for security, leaks, corrosion, cracks, bends and
pinching and any evidence of chafing.
g.
Check electrical connections and circuit breakers for proper size, security and condition. Check
instrument lighting system for range of illumination, burned out bulbs and defective controls. Check wiring
for chafing, excessive tension, improper support or broken lacing and ties.
h.
Check instruments for evidence of overheating or contamination of equipment by foreign matter
or water. Dust, dirt and lint contribute to overheating of equipment, poor ventilation and malfunctioning.
Special attention should be given that ventilation openings in equipment housings are open and free from
obstructing lint and dust.
INSTRUMENTS
Reissued: 9/23/80
3A14