Narrative:

Routine takeoff from merced, ca to san francisco (sfo). One passenger on board. PF was me, the first officer. At approximately 1000' AGL, I called for 'propellers 85% climb check'. The captain did the propeller reduction, which was followed within seconds by a loud bang and dull thud in the airplane. (Perhaps 30 seconds earlier, I had turned on the acm bleeds, part of the climb check.) following the bang, all indicators were normal, engines ok, and exterior appeared ok. Within another minute, however, we both smelled smoke, and the captain communicated with the passenger, who indicated unusual heat in the cabin. The captain told me this and that he saw smoke. I immediately began turning back to mce and descending, while the captain notified castle approach of our emergency situation and intentions. He also shut down the acm and associated bleeds. Following this, the smoke dissipated. Landing at mce was normal, and we taxied clear and evacuated. Cause: P3 bleed line under floor of cabin blew, sending hot, high pressure air under floor.

Related reports:

Google
 

Original NASA ASRS Text

Title: COMMUTER SMT HIGH PRESSURE BLEED LINE RUPTURED JUST AFTER TKOF CAUSING HIGH CABIN TEMPERATURE AND SMOKE IN THE ACFT.

Narrative: ROUTINE TKOF FROM MERCED, CA TO SAN FRANCISCO (SFO). ONE PAX ON BOARD. PF WAS ME, THE F/O. AT APPROX 1000' AGL, I CALLED FOR 'PROPELLERS 85% CLIMB CHECK'. THE CAPT DID THE PROPELLER REDUCTION, WHICH WAS FOLLOWED WITHIN SECONDS BY A LOUD BANG AND DULL THUD IN THE AIRPLANE. (PERHAPS 30 SECONDS EARLIER, I HAD TURNED ON THE ACM BLEEDS, PART OF THE CLIMB CHECK.) FOLLOWING THE BANG, ALL INDICATORS WERE NORMAL, ENGINES OK, AND EXTERIOR APPEARED OK. WITHIN ANOTHER MINUTE, HOWEVER, WE BOTH SMELLED SMOKE, AND THE CAPT COMMUNICATED WITH THE PAX, WHO INDICATED UNUSUAL HEAT IN THE CABIN. THE CAPT TOLD ME THIS AND THAT HE SAW SMOKE. I IMMEDIATELY BEGAN TURNING BACK TO MCE AND DESCENDING, WHILE THE CAPT NOTIFIED CASTLE APCH OF OUR EMER SITUATION AND INTENTIONS. HE ALSO SHUT DOWN THE ACM AND ASSOCIATED BLEEDS. FOLLOWING THIS, THE SMOKE DISSIPATED. LNDG AT MCE WAS NORMAL, AND WE TAXIED CLEAR AND EVACUATED. CAUSE: P3 BLEED LINE UNDER FLOOR OF CABIN BLEW, SENDING HOT, HIGH PRESSURE AIR UNDER FLOOR.

Data retrieved from NASA's ASRS site as of August 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.