AN A320 FO NOTICED A SIGNIFICANT PROB WITH THE REINFORCED COCKPIT DOOR LOCKING MECHANISM WHEN USED ELECTRONICALLY; RATHER THAN MANUALLY.

Date: 2003-12 · Aircraft: A320 · Phase: cruise

Anomalies: deviation-discrepancy-procedural-far|deviation-discrepancy-procedural-published-material-policy

Synopsis

AN A320 FO NOTICED A SIGNIFICANT PROB WITH THE REINFORCED COCKPIT DOOR LOCKING MECHANISM WHEN USED ELECTRONICALLY; RATHER THAN MANUALLY.

Narrative

I AM WRITING THIS RPT TO POINT OUT A POTENTIAL PROB WITH THE REINFORCED A320 COCKPIT DOOR. ON A RECENT FLT I NOTICED THAT THE TOP LATCH DIDN'T LOOK RIGHT. HOWEVER; ALL COCKPIT INDICATIONS REGARDING THE DOOR WERE NORMAL. AFTER LNDG; WHEN I HAD THE CHANCE TO EXAMINE THE LOCK MORE CLOSELY; I DISCOVERED THAT THE TOP STRIKE PLATE/LATCH WAS ACTUALLY TILTED FORWARD IN FRONT OF THE LOCKING PIN; NOT BEHIND IT. THIS MEANT THAT THE LATCH WAS IN FACT NOT LOCKED; EVEN THOUGH NO FAULT LIGHTS WERE ILLUMINATED. FURTHER INVESTIGATION REVEALED THAT IT IS POSSIBLE FOR ALL OF THE LATCHES TO BE FORWARD OF THEIR LOCKING PINS WITH THE DOOR INDICATING CLOSED AND NO FAULT INDICATIONS WHATSOEVER. IN THIS CONDITION; THE DOOR CAN BE OPENED WITH A SIMPLE PUSH EVEN THOUGH IT INDICATES LOCKED. THE SIT DESCRIBED ABOVE IS ONLY POSSIBLE IF THE DOOR IS UNLOCKED ELECTRONICALLY; IE THE LOCKING PINS ARE RETRACTED AND THE LATCHES ARE ALLOWED FORWARD OF THEIR LOCKING PINS. FOLLOWING OUR CURRENT SOP IT SHOULD BE HIGHLY UNLIKELY THAT THIS SIT COULD OCCUR. HOWEVER; WHEN/IF WE INSTALL CAMERAS AND ALLOW THE USE OF THE ELECTRONIC UNLOCK SYSTEM; THE POSSIBILITY OF THIS OCCURRING WOULD GREATLY INCREASE. ALSO; THE LATCH I FOUND UNLOCKED GOT THERE SOMEHOW; IMPROPER SOP; MAINT; USE OF THE EMER ENTRANCE CODE; ETC.

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Source: NASA Aviation Safety Reporting System (public domain). Reports are voluntary submissions and are not verified by NASA.