A lancair iv/G door departed in flight at 12;500 ft after the pilot checked the door seal. The cabin...

Narrative:

After departing; we were being vectored around traffic during the climb sequence of the flight. Upon receiving clearance to FL230; I noticed the cabin pressure light begin to intermittently flash. I increased the cabin inflow and adjusted the cabin altitude; with only a slight improvement of the annunciator panel. The door lock and door seal lights were in their normal lit configuration at this time. I recycled the door seal to test its integrity. Shortly thereafter; the door flew open; with resultant depressurization. Cabin contents were flying about the cabin; my headset and glasses departed the plane; along with my passenger's purse; papers; and pillows. A blanket from the back seat covered my head and face; and was pulling my head out of the cabin into the slipstream. My passenger pulled the blanket off my head; and I saw we were in a steep nose down attitude. I pulled back power and eased the descent. The plane was very difficult to control at this point; and cabin contents were flying around; hitting us both. I elected to try to get the plane under control before considering an attempt at landing. I asked my passenger to replace my headset onto my head; and I was able to communicate with ATC; informing them that we had lost our door. At some point; the door completely departed the plane; improving the flight characteristics considerably. After slowing down and aggressively trimming; I was able to get back control of the plane and said we would return to the departure airport since the plane was now flyable and the runway environs were familiar. After a couple of minutes of trying to communicate with center; I checked my headset cord; and realized it had been shredded by the prop wash and was unusable. I had my passenger place her headset on my head and used her push-to-talk button to communicate. I asked for permission to change to tower frequency and requested a downwind approach to runway 01; since it would give me a chance to test the flight characteristics in the landing configuration at pattern altitude. Tower immediately cleared us to land. With flaps and gear down; the plane was more stable; and the landing was uneventful.

Original NASA ASRS Text

Title: A Lancair IV/G door departed in flight at 12;500 FT after the pilot checked the door seal. The cabin pressure light was flashing intermittently even though the door lock and door seal lights were normally configured.

Narrative: After departing; we were being vectored around traffic during the climb sequence of the flight. Upon receiving clearance to FL230; I noticed the cabin pressure light begin to intermittently flash. I increased the cabin inflow and adjusted the cabin altitude; with only a slight improvement of the annunciator panel. The door lock and door seal lights were in their normal lit configuration at this time. I recycled the door seal to test its integrity. Shortly thereafter; the door flew open; with resultant depressurization. Cabin contents were flying about the cabin; my headset and glasses departed the plane; along with my passenger's purse; papers; and pillows. A blanket from the back seat covered my head and face; and was pulling my head out of the cabin into the slipstream. My passenger pulled the blanket off my head; and I saw we were in a steep nose down attitude. I pulled back power and eased the descent. The plane was very difficult to control at this point; and cabin contents were flying around; hitting us both. I elected to try to get the plane under control before considering an attempt at landing. I asked my passenger to replace my headset onto my head; and I was able to communicate with ATC; informing them that we had lost our door. At some point; the door completely departed the plane; improving the flight characteristics considerably. After slowing down and aggressively trimming; I was able to get back control of the plane and said we would return to the departure airport since the plane was now flyable and the runway environs were familiar. After a couple of minutes of trying to communicate with Center; I checked my headset cord; and realized it had been shredded by the prop wash and was unusable. I had my passenger place her headset on my head and used her push-to-talk button to communicate. I asked for permission to change to Tower frequency and requested a downwind approach to Runway 01; since it would give me a chance to test the flight characteristics in the landing configuration at pattern altitude. Tower immediately cleared us to land. With flaps and gear down; the plane was more stable; and the landing was uneventful.

Data retrieved from NASA's ASRS site as of July 2013 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.

Attributes
ACN	1047157
Time
Date	201211
Local Time Of Day	0601-1200
Place
Locale Reference	ZZZ.Airport
State Reference	US
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Make Model Name	Lancair IV/IVP
Operating Under FAR Part	Part 91
Flight Phase	Climb
Route In Use	Vectors
Flight Plan	IFR
Component
Aircraft Component	Exterior Pax/Crew Door
Person 1
Function	Single Pilot Pilot Flying
Qualification	Flight Crew Instrument Flight Crew Multiengine Flight Crew Private
Experience	Flight Crew Last 90 Days 52 Flight Crew Total 1212 Flight Crew Type 52
Events
Anomaly	Aircraft Equipment Problem Critical Flight Deck / Cabin / Aircraft Event Other / Unknown Inflight Event / Encounter Loss Of Aircraft Control

A lancair iv/G door departed in flight at 12;500 ft after the pilot checked the door seal. The cabin pressure light was flashing intermittently even though the door lock and door seal lights were normally configured.