Arrow PA-28R-201 Pilot's Operating Handbook And Faa Approved Airplane Flight Manual page 55

SECTION 3 PIPER AIRCRAFT CORPORATION
EMERGENCY PROCEDURES PA-28R-201, ARROW
3.37 ENGINE ROUGHNESS (3.Sp) (Continued)
The magneto switch should then be moved L, then R. then back to (
ROTH. If operation is satisfactory on either magneto. proceed on that
magneto at reduced power with full RICH mixture to a landing at the first
available airport.
If roughness persists. prepare for a precautionary landing at pilot's
discretion.
REPORT: VB-136S
3-20
ISSUED: SEPTEMBER 15,1988
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