SECTION 9
PIPER AIRCRAFT CORPORATION
SUPPLEMENTS
PA-28-236, DAKOTA
REPORT: VB-910
ISSUED: AUGUST 1, 1980
9-20
(1) Altitude Loss During Malfunction:
a. An autopilot malfunction during climb, cruise or descent w i t h
a 3 second delay in recovery initiation could result in
as much as 60° of bank and 320’ altitude Joss. Maximum
altitude Joss was recorded at 155 KIAS during descent.
b. An autopilot malfunction during an approach with a 1 second
delay in recovery initiation could result in as much as 15°
bank and 20’ altitude loss. Maximum altitude loss measured
in approach configuration, and operating either coupled or
uncoupled.
(b) COMPASS SYSTEM
(1) Emergency Operation With Optional NSD 360A (HSI) Slaved and
/ or Non-Slaved:
NSD 360A
a. Appearance of HDG Flag:
1. Check air supply gauge (vac or pressure) for adequate air
supply (4 in. Hg. min.).
2. Check compass circuit breaker.
3. Observe display for proper operation.
b. To disable heading card - pull circuit breaker and use
magnetic compass for directional data.
- NOTE -
If heading card is not operational, autopilot
should not be used.
c. With card disabled VOR/Localizer and Glide Slope displays
are still functional; use card set to rotate card to aircraft
heading for correct picture.
d. Slaving Failure - (i.e. failure to self correct for gyro drift):
1. Check gyro slaving switch is set to No. 1 position (if
equipped with Slave No. 1 - No. 2 switch) or “Slaved”
position when equipped with Slaved and Free Gyro Mode
Switch.
2. Check for HDG Flag.
3. Check compass circuit breaker.
4. Reset heading card while observing slaving meter.
Summary of Contents for PA-28-236 DAKOTA
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