- Joined
- Sep 16, 2019
- Messages
- 543
- Reaction score
- 194
Preface- PA32-300, EDM 830. 500h SMOH, mags 20h overdue for optional IRAN.
Impulse mag AD due in 20hrs
All plugs replaced with tempest fine-wire about 30h ago
IFR Checkride last Friday-
Flight friday am went fine, good start, no issues. Normal runup and temps for 1hr flight
Friday afternoon (after oral complete)- runup for flight portion. Complete drop out on #3 cylinder during left mag check. Normal ops on right mag and other cylinders look good temp wise. On both saw higher EGT on #3 consistent with this as well (normal CHT)
Did 3min lean ground run to try to burn it off- no change.
Abort checkride flight.
Dilemma- mechanic tells me quick look at plug and plug wire connection good. Thinks it may be harness vs Mag.
Had planned on doing Impulse coupler AD and Mag replacement or overhaul after I finished my checkride and after a planned trip in 2 weeks. Question now is whether to 1) go ahead and replace Mags and harness now 2)replace harness only to get flying and hold Mag check and impulse AD for later 3) consider Surefly (not sure how long the lead time is)
Could a bad mag point cause a single plug to fail to fire without other symptoms? Harness is probably 15y old as that was when the engine was overhauled by Zephyr.
Impulse mag AD due in 20hrs
All plugs replaced with tempest fine-wire about 30h ago
IFR Checkride last Friday-
Flight friday am went fine, good start, no issues. Normal runup and temps for 1hr flight
Friday afternoon (after oral complete)- runup for flight portion. Complete drop out on #3 cylinder during left mag check. Normal ops on right mag and other cylinders look good temp wise. On both saw higher EGT on #3 consistent with this as well (normal CHT)
Did 3min lean ground run to try to burn it off- no change.
Abort checkride flight.
Dilemma- mechanic tells me quick look at plug and plug wire connection good. Thinks it may be harness vs Mag.
Had planned on doing Impulse coupler AD and Mag replacement or overhaul after I finished my checkride and after a planned trip in 2 weeks. Question now is whether to 1) go ahead and replace Mags and harness now 2)replace harness only to get flying and hold Mag check and impulse AD for later 3) consider Surefly (not sure how long the lead time is)
Could a bad mag point cause a single plug to fail to fire without other symptoms? Harness is probably 15y old as that was when the engine was overhauled by Zephyr.
