2
nd
Edition - Rev 0
SUPPLEMENT SG-1
CHAPTER 34 - NAVIGATION
Page 17
AIRSPEED FAIL
ALTITUDE FAIL
VERT SPEED
FAIL
GDC 74A
• Ensure that a cell phone or a device using
cell phone technology is not turned on
(even in a monitoring state) in the cabin.
• Check PFD Alert Window for PFD, MFD
or GDC configuration, software or failed
data path error messages. Correct any errors
before proceeding.
• Inspect GDC 74A pitot/static ports and
plumbing for blockage.
• Check GDC 74A configuration settings.
Reload if unsure they are correct.
• If configuration settings are correct, replace
the GDC 74A configuration module.
• If problem persists, replace the GDC 74A.
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