Narrative:

Shortly after reaching FL290, the right generator and AC xtie lockout light illuminated. The autoplt disengaged and the automatic pressurization failed. Attempts to control the cabin were unsuccessful. ATC was advised, an emergency declared, and an emergency descent was begun. The important priority was unsatisfactory pressurization and passenger safety. During the emergency descent, the right engine oil quantity and pressure indicated zero. The right engine was secured and checklists were completed. It was determined that the right engine oil pressure and quantity were in fact operating normally. Therefore, the right engine was restarted. A routine approach and landing at pit followed. Upon arrival at the gate, a log entry was made. Callback conversation with reporter revealed the following information: reporter advised with AC xtie lockout the right AC bus was lost causing loss of the captain instruments. Feels the electrical failure compounded the pressurization problem. They were still having problems trying to control the cabin in manual and elected to declare an emergency and return to pit. Noted no oil quantity or pressure on the right engine and elected to shut down. Completing the checklist started the APU, which pwred the right AC bus, resulting in engine oil and pressure registering normal. Restarted the right engine and made a normal 2 engine landing. At lower altitude cabin stabilized and the masks were not deployed. ATC provided priority handling for the descent and approach to pit. Main concern was a possible engine explosion rupturing the cabin consequently the declaring emergency.

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Original NASA ASRS Text

Title: DC9-30 MAINTAINING FL290 LOST THE R GENERATOR AND AC XTIE LOCKOUT LIGHT ILLUMINATED. AUTOPLT DISENGAGED AND AUTOPRESSURIZATION CTL FAILED. EMER WAS DECLARED AND RETURN TO PIT. NOTED LOSS OF OIL PRESSURE AND QUANTITY R ENG SO SHUT DOWN. COMPLETING CHKLIST STARTED APU REGAINING ELECTRICAL PWR TO THE R AC BUS AND HAD NORMAL INDICATIONS ON OIL PRESSURE AND QUANTITY. RESTARTED R ENG AND LANDED NORMALLY PIT. OXYGEN MASKS NEVER DEPLOYED.

Narrative: SHORTLY AFTER REACHING FL290, THE R GENERATOR AND AC XTIE LOCKOUT LIGHT ILLUMINATED. THE AUTOPLT DISENGAGED AND THE AUTO PRESSURIZATION FAILED. ATTEMPTS TO CTL THE CABIN WERE UNSUCCESSFUL. ATC WAS ADVISED, AN EMER DECLARED, AND AN EMER DSCNT WAS BEGUN. THE IMPORTANT PRIORITY WAS UNSATISFACTORY PRESSURIZATION AND PAX SAFETY. DURING THE EMER DSCNT, THE R ENG OIL QUANTITY AND PRESSURE INDICATED ZERO. THE R ENG WAS SECURED AND CHKLISTS WERE COMPLETED. IT WAS DETERMINED THAT THE R ENG OIL PRESSURE AND QUANTITY WERE IN FACT OPERATING NORMALLY. THEREFORE, THE R ENG WAS RESTARTED. A ROUTINE APCH AND LNDG AT PIT FOLLOWED. UPON ARR AT THE GATE, A LOG ENTRY WAS MADE. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: RPTR ADVISED WITH AC XTIE LOCKOUT THE R AC BUS WAS LOST CAUSING LOSS OF THE CAPT INSTS. FEELS THE ELECTRICAL FAILURE COMPOUNDED THE PRESSURIZATION PROB. THEY WERE STILL HAVING PROBS TRYING TO CTL THE CABIN IN MANUAL AND ELECTED TO DECLARE AN EMER AND RETURN TO PIT. NOTED NO OIL QUANTITY OR PRESSURE ON THE R ENG AND ELECTED TO SHUT DOWN. COMPLETING THE CHKLIST STARTED THE APU, WHICH PWRED THE R AC BUS, RESULTING IN ENG OIL AND PRESSURE REGISTERING NORMAL. RESTARTED THE R ENG AND MADE A NORMAL 2 ENG LNDG. AT LOWER ALT CABIN STABILIZED AND THE MASKS WERE NOT DEPLOYED. ATC PROVIDED PRIORITY HANDLING FOR THE DSCNT AND APCH TO PIT. MAIN CONCERN WAS A POSSIBLE ENG EXPLOSION RUPTURING THE CABIN CONSEQUENTLY THE DECLARING EMER.

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.