Saab 340 notified after takeoff that right engine cowling was open.

Attributes
ACN	321747
Time
Date	199511
Day	Thu
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : phl
State Reference	PA
Altitude	agl bound lower : 200 agl bound upper : 200
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tower : phl
Operator	common carrier : air carrier
Make Model Name	SF 340A
Operating Under FAR Part	Part 121
Flight Phase	climbout : takeoff landing other
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : cfi pilot : atp
Experience	flight time last 90 days : 50 flight time total : 7000 flight time type : 50
ASRS Report	321747
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : instrument pilot : commercial
Events
Anomaly	aircraft equipment problem : critical other anomaly other
Independent Detector	other controllera
Resolutory Action	flight crew : declared emergency other
Consequence	Other
Supplementary
Primary Problem	Flight Crew Human Performance

Narrative:

Saab 340 part 121 passenger flight departing runway 27L at phl. At approximately 200 ft AGL it was overheard on tower frequency that the departing saab had an open cowling on the right engine. We advised phl tower that we copied and that we would be returning for landing. Controllability was normal until we turned for the left base to runway 35, at which point the aircraft began to shudder and dutch roll. We then declared an emergency and I reduced power and lowered the pitch in an attempt to improve the handling characteristics. It stabilized somewhat and we landed on runway 35 without further incident.

Original NASA ASRS Text

Title: SAAB 340 NOTIFIED AFTER TKOF THAT R ENG COWLING WAS OPEN.

Narrative: SAAB 340 PART 121 PAX FLT DEPARTING RWY 27L AT PHL. AT APPROX 200 FT AGL IT WAS OVERHEARD ON TWR FREQ THAT THE DEPARTING SAAB HAD AN OPEN COWLING ON THE R ENG. WE ADVISED PHL TWR THAT WE COPIED AND THAT WE WOULD BE RETURNING FOR LNDG. CONTROLLABILITY WAS NORMAL UNTIL WE TURNED FOR THE L BASE TO RWY 35, AT WHICH POINT THE ACFT BEGAN TO SHUDDER AND DUTCH ROLL. WE THEN DECLARED AN EMER AND I REDUCED PWR AND LOWERED THE PITCH IN AN ATTEMPT TO IMPROVE THE HANDLING CHARACTERISTICS. IT STABILIZED SOMEWHAT AND WE LANDED ON RWY 35 WITHOUT FURTHER INCIDENT.

Data retrieved from NASA's ASRS site as of July 2007 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.