What happened
The FAA’s narrative, in sentence case. The FAA writes it in capitals and removes private details.
(-23) Shortly after departing phl airborne express flight 437 declared an emergency with ATC after the first officer smelled a strong odor of burning electrical equipment. The first officer immediately went on oxygen as did the other crew members. The captain reported extreme heat under his seat and around his leg area and stated he had a hard time sitting still because of the heat. The first officer piloted the aircraft back to phl and landed safely on runway 9R. After the aircraft was stopped on taxiway sierra, the captain executed the emergency evacuation checklist because of possible fire. All crew and company personnel were evacuated down a fireman's ladder at the L1 door exit without injury. The slide raft at this door was not activated because there was little evidence of smoke and no evidence of immediate fire. No other exits were used during the evacuation, which took approximately 90 seconds. This aircraft is equipped with a flight deck supplemental heating system which supplies warm air to the captain's and first officer's foot area and shoulder area. The pilot's foot air supply heater switch was in the hi position and the shoulder in low position. The first officer's foot and shoulder air supply heater switch were in low position. Visual inspection of the forward equipment bay and main equipment center areas revealed no evidence of burnt electrical equipment and or wires. Visual inspection of the flight deck and pilot's seat area revealed no evidence of burnt electrical equipment and or wires.
As the FAA filed it
(-23) SHORTLY AFTER DEPARTING PHL AIRBORNE EXPRESS FLIGHT 437 DECLARED AN EMERGENCY WITH ATC AFTER THE FIRST OFFICER SMELLED A STRONG ODOR OF BURNING ELECTRICAL EQUIPMENT. THE FIRST OFFICER IMMEDIATELY WENT ON OXYGEN AS DID THE OTHER CREW MEMBERS. THE CAPTAIN REPORTED EXTREME HEAT UNDER HIS SEAT AND AROUND HIS LEG AREA AND STATED HE HAD A HARD TIME SITTING STILL BECAUSE OF THE HEAT. THE FIRST OFFICER PILOTED THE AIRCRAFT BACK TO PHL AND LANDED SAFELY ON RUNWAY 9R. AFTER THE AIRCRAFT WAS STOPPED ON TAXIWAY SIERRA, THE CAPTAIN EXECUTED THE EMERGENCY EVACUATION CHECKLIST BECAUSE OF POSSIBLE FIRE. ALL CREW AND COMPANY PERSONNEL WERE EVACUATED DOWN A FIREMAN'S LADDER AT THE L1 DOOR EXIT WITHOUT INJURY. THE SLIDE RAFT AT THIS DOOR WAS NOT ACTIVATED BECAUSE THERE WAS LITTLE EVIDENCE OF SMOKE AND NO EVIDENCE OF IMMEDIATE FIRE. NO OTHER EXITS WERE USED DURING THE EVACUATION, WHICH TOOK APPROXIMATELY 90 SECONDS. THIS AIRCRAFT IS EQUIPPED WITH A FLIGHT DECK SUPPLEMENTAL HEATING SYSTEM WHICH SUPPLIES WARM AIR TO THE CAPTAIN'S AND FIRST OFFICER'S FOOT AREA AND SHOULDER AREA. THE PILOT'S FOOT AIR SUPPLY HEATER SWITCH WAS IN THE HI POSITION AND THE SHOULDER IN LOW POSITION. THE FIRST OFFICER'S FOOT AND SHOULDER AIR SUPPLY HEATER SWITCH WERE IN LOW POSITION. VISUAL INSPECTION OF THE FORWARD EQUIPMENT BAY AND MAIN EQUIPMENT CENTER AREAS REVEALED NO EVIDENCE OF BURNT ELECTRICAL EQUIPMENT AND OR WIRES. VISUAL INSPECTION OF THE FLIGHT DECK AND PILOT'S SEAT AREA REVEALED NO EVIDENCE OF BURNT ELECTRICAL EQUIPMENT AND OR WIRES.