J.P. Instruments EDM 900 Pilots Guide - Manual (Page 48)

Page 48 Engine Data Management
HOBSERR The time of the most recent flight may not be
reflected in the HOBBS meter.
HOBSBAD
The HOBBS data has been corrupted. The HOBBS
meter will be cleared.
HANGCFG,
HANGCAL
Internal system errors. Return unit to factory.
GPS Interface Diagnostics
Measurements ‘xxx REQ’,
‘xxx RES’ and ‘xxx MPG’ are all
missing from the scan.
No communications from GPS
receiver to EDM. Possibly no
connection or aircraft GPS is off.
NO - COM message and
‘xxx REQ’, ‘xxx RES’ and
‘xxx MPG’ are all missing from
the scan.
Communications are received by
EDM and the Auto-Protocol setup is
in process. Verify correct output
format setup in GPS receiver; check
GPS connections.
NO - SIG message and
‘xxx REQ’, ‘xxx RES’ and
‘xxx MPG’ are all missing from
the scan.
GPS receiver has insufficient signal
for valid data.
NO - WPT message and
‘xxx REQ’, ‘xxx RES’ are all
missing from the scan.
No waypoints are programmed into
the aircraft GPS receiver.
Section 12 - Appendices
Shock Cooling (CLD)
Cooling the cylinders too fast can result in cracking and eventual failure.
Lycoming Service Instruction 1094D (March 25, 1994) on
Fuel Mixture
Leaning Procedures states:
“At all times, caution must be taken not to shock cool the cylinders. The
maximum recommended temperature change from Lycoming should
not exceed 50°F per minute cooling rate.”
JPI checks shock cooling (CLD) on all cylinders displaying the
fastest cooling cylinder in degrees per minute cool rate.