|37000 Feet||Browse and search NASA's
Aviation Safety Reporting System
|Local Time Of Day||0601 To 1200|
|Locale Reference||airport : ewr|
|Altitude||agl bound lower : 0|
agl bound upper : 0
|Operator||common carrier : air carrier|
|Make Model Name||Medium Large Transport, Low Wing, 2 Turbojet Eng|
|Navigation In Use||Other|
|Flight Phase||ground : preflight|
|Affiliation||company : air carrier|
|Function||flight crew : captain|
oversight : pic
|Qualification||pilot : atp|
|Experience||flight time last 90 days : 250|
flight time total : 9000
flight time type : 3000
|Function||flight attendant : on duty|
|Qualification||other other : other|
|Anomaly||aircraft equipment problem : less severe|
|Independent Detector||other other : unspecified|
|Resolutory Action||flight crew : overcame equipment problem|
|Air Traffic Incident||other|
Arrived at aircraft to operate ewr to bos. After briefing the cabin attendants, the first F/a informed me that the cabin to cockpit call system was inoperative. Further investigation revealed that a circuit breaker was pulled and resetting it solved the problem. It was interesting to note that the circuit breaker that pwrs this required system is the same circuit breaker that power the takeoff warning system in the medium large transport (circuit breaker P-38-CAWS). I think that the power for this chime system should be drawn from another source. Should the center aural warning circuit breaker be open for some reason, and an improper flap/slat combination be selected for takeoff, a cabin crew member could not signal the cockpit should a passenger or crew member notice the discrepancy. Callback conversation with reporter revealed the following: the adjacent call system circuit breaker is for the passenger cabin call lights. The circuit breaker in question is a checklist item for this airline and a copy of this report has been given to the airline management. Reporter indicated that his company does not think the safety improvement suggestion is very important and no action is being taken.
Original NASA ASRS Text
Title: CABIN ATTENDANT NOTED CABIN TO COCKPIT CALL SYSTEM INOPERATIVE DURING PREFLT CHECK AND ADVISED THE PIC. FLT CREW RESET TKOF WARNING CIRCUIT BREAKER CORRECTING THE PROBLEM. PIC THINKS THIS CABIN CALL POWER SOURCE SHOULD BE SEPARATE FROM TKOF WARNING POWER SOURCE.
Narrative: ARRIVED AT ACFT TO OPERATE EWR TO BOS. AFTER BRIEFING THE CABIN ATTENDANTS, THE FIRST F/A INFORMED ME THAT THE CABIN TO COCKPIT CALL SYS WAS INOP. FURTHER INVESTIGATION REVEALED THAT A CB WAS PULLED AND RESETTING IT SOLVED THE PROB. IT WAS INTERESTING TO NOTE THAT THE CB THAT PWRS THIS REQUIRED SYS IS THE SAME CB THAT PWR THE TKOF WARNING SYS IN THE MLG (CB P-38-CAWS). I THINK THAT THE PWR FOR THIS CHIME SYS SHOULD BE DRAWN FROM ANOTHER SOURCE. SHOULD THE CENTER AURAL WARNING CB BE OPEN FOR SOME REASON, AND AN IMPROPER FLAP/SLAT COMBINATION BE SELECTED FOR TKOF, A CABIN CREW MEMBER COULD NOT SIGNAL THE COCKPIT SHOULD A PAX OR CREW MEMBER NOTICE THE DISCREPANCY. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING: THE ADJACENT CALL SYS CB IS FOR THE PAX CABIN CALL LIGHTS. THE CB IN QUESTION IS A CHKLIST ITEM FOR THIS AIRLINE AND A COPY OF THIS RPT HAS BEEN GIVEN TO THE AIRLINE MGMNT. RPTR INDICATED THAT HIS COMPANY DOES NOT THINK THE SAFETY IMPROVEMENT SUGGESTION IS VERY IMPORTANT AND NO ACTION IS BEING TAKEN.
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.