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Aircraft equipment problem -- air carrier captain inadvertently opens a circuit breaker when he releases his shoulder harness after takeoff. Air carrier returns to land when the pressurization system does not work.
| Attributes | |
| ACN | 303531 |
| Time | |
| Date | 199505 |
| Day | Tue |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | airport : iah |
| State Reference | TX |
| Altitude | msl bound lower : 10000 msl bound upper : 10000 |
| Aircraft 1 | |
| Controlling Facilities | artcc : zhu tracon : iah |
| Operator | common carrier : air carrier |
| Make Model Name | MD-80 Super 80 |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | Other |
| Flight Phase | climbout : intermediate altitude |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| ASRS Report | 303531 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : commercial pilot : instrument |
| Events | |
| Anomaly | aircraft equipment problem : less severe other anomaly other |
| Independent Detector | aircraft equipment other aircraft equipment : unspecified other other : unspecified |
| Resolutory Action | flight crew : overcame equipment problem other |
| Consequence | Other |
| Supplementary | |
| Primary Problem | Flight Crew Human Performance |
| Air Traffic Incident | Pilot Deviation |
Narrative:
During climb out from iah cabin pressurization did not work properly. Descended to 10000 ft, used manual mode of pressurization, and returned to iah. After returning to gate mechanic noticed the cabin pressure control circuit breaker was popped, suspect caused by retraction of captain's shoulder harness. Checked system, reset circuit breaker and returned to service. Callback conversation with reporter revealed the following information: the reporter said that he had not heard about this type of incident before this in spite of having over 2000 hours in the md-80, super 80 and neither had instructors in the training center, but many of the pilots that used to fly the aircraft had. These pilots had flown the aircraft when it was first at the company and they had upgraded to bigger aircraft now, but recalled this phenomenon in the md-80. This analyst has witnessed this several times in his career in the md-80.
Original NASA ASRS Text
Title: ACFT EQUIP PROB -- ACR CAPT INADVERTENTLY OPENS A CIRCUIT BREAKER WHEN HE RELEASES HIS SHOULDER HARNESS AFTER TKOF. ACR RETURNS TO LAND WHEN THE PRESSURIZATION SYS DOES NOT WORK.
Narrative: DURING CLBOUT FROM IAH CABIN PRESSURIZATION DID NOT WORK PROPERLY. DSNDED TO 10000 FT, USED MANUAL MODE OF PRESSURIZATION, AND RETURNED TO IAH. AFTER RETURNING TO GATE MECH NOTICED THE CABIN PRESSURE CTL CIRCUIT BREAKER WAS POPPED, SUSPECT CAUSED BY RETRACTION OF CAPT'S SHOULDER HARNESS. CHKED SYS, RESET CIRCUIT BREAKER AND RETURNED TO SVC. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: THE RPTR SAID THAT HE HAD NOT HEARD ABOUT THIS TYPE OF INCIDENT BEFORE THIS IN SPITE OF HAVING OVER 2000 HRS IN THE MD-80, SUPER 80 AND NEITHER HAD INSTRUCTORS IN THE TRAINING CTR, BUT MANY OF THE PLTS THAT USED TO FLY THE ACFT HAD. THESE PLTS HAD FLOWN THE ACFT WHEN IT WAS FIRST AT THE COMPANY AND THEY HAD UPGRADED TO BIGGER ACFT NOW, BUT RECALLED THIS PHENOMENON IN THE MD-80. THIS ANALYST HAS WITNESSED THIS SEVERAL TIMES IN HIS CAREER IN THE MD-80.
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.