A PA31 pilot noticed the right engine cowling departed the aircraft in descent.

Attributes
ACN	750952
Time
Date	200708
Local Time Of Day	0601 To 1200
Place
Locale Reference	atc facility : zbw.artcc
State Reference	MA
Altitude	msl single value : 6000
Environment
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zzz.artcc
Operator	common carrier : air carrier general aviation : personal
Make Model Name	PA-31 Navajo Chieftan/Mojave/Navajo T1020
Operating Under FAR Part	Part 91
Flight Phase	descent : intermediate altitude
Person 1
Affiliation	other
Function	flight crew : single pilot
Qualification	pilot : cfi pilot : commercial pilot : instrument pilot : multi engine
Experience	flight time last 90 days : 20 flight time total : 5000 flight time type : 500
ASRS Report	750952
Events
Anomaly	aircraft equipment problem : less severe other anomaly other
Independent Detector	other flight crewa
Resolutory Action	none taken : detected after the fact
Supplementary
Problem Areas	Flight Crew Human Performance Aircraft
Primary Problem	Ambiguous

Narrative:

During descent right cowling departed aircraft.

Original NASA ASRS Text

Title: A PA31 PILOT NOTICED THE RIGHT ENG COWLING DEPARTED THE AIRCRAFT IN DESCENT.

Narrative: DURING DSCNT R COWLING DEPARTED ACFT.

Data retrieved from NASA's ASRS site as of January 2009 and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.