While traveling around offering my services to wonderful cirrus
owners I have
once again a good story to tell and hopefully we can all benefit. This one starts with a prop
balance. I traveled to the clients home base and performed the
routine service. We calculated the balance down to
the 'gazinth' of a gram and I proceded on my way home. Several days later I
received a phone call, the
client reported about his last flight. I wouldn't say this was an eventful flight
but it wasn't "eventless". On climb out the MFD was indicating high EGT and CHT temperatures on the #6 cylinder, he landed and had maintenance examine the problem. ( Discovering a cracked fine wire spark plug). I asked him to also send me
the Emax download.(see below figure 1). Here is what the pilot of the
SR-20 had to say and I quote " I would have pulled back power much sooner,
however due to the history of erratic indications I second guessed the
situation and delayed my first instinct."
The flight in question...with calculated peak temps for the #6 cylinder...note the #5 is also climbing....
Calculated probable peak CHT values
Remember my New Years Eve flight in Duluth? The pilot did not
believe his instrumentation...(and with good cause)...sensor connectors
have been shown unreliable.... to the point of pilots discrediting REAL
PROBLEMS.
When you don't trust the data presented, make the system reliable....act on the results as "true" until proven "false"
Next ....what is happening to the cylinder after the high temp event?
Posted
9 Jul 2009 9:23
by
Jim Barker