Narrative:

On the ground; we had a cargo btl lo message. We incorrectly followed the QRH procedure for the event. We did not realize that we had done so until we were [en route]. The correct QRH procedure was followed once the error was realized; it called for a landing at the nearest suitable airport. The flight crew and the dispatcher came to a mutual decision on the nearest suitable airport. The diversion and subsequent continuation of the flight was uneventful. In flight when the captain was writing the procedure up; something did not seem right. On the ground; we had a lengthy maintenance delay because a passenger's oxygen mask had dropped. After the very lengthy delay; we had an APU battery charger status message that popped up indicating that the APU battery was not charging. The message ended up going away; but the memory of that message was still ingrained in my mind when we taxied out for takeoff. Just prior to the end of the runway; the caution message popped up. We both looked at the message and I was of the opinion that either the bottle had leaked or the message was an error. I brought out the QRH and looked up the cargo btl message under the fire protection tab. I noticed that it was the last message in the index of that tab. Once I saw that it was on the last page; I went to the last page of the fire protection QRH section and started reading at the top. I started reading at the top without really noticing the title of the QRH procedure. I was able to see that I was on the last page and didn't realize that there were multiple QRH procedures on the same page. We followed the procedure for an APU bottle lo not cargo bottle lo; the result of the procedure was that we determined that an error message had occurred and since we had already blocked out we both felt comfortable proceeding. Reading the title of the checklist aloud or having a chart on the QRH that explains the message more in depth might have told us that were looking at the wrong message.

Related reports:

Google
 

Original NASA ASRS Text

Title: An air carrier First Officer reported receiving a CARGO BTL LO EICAS message on taxi out. The crew followed the wrong QRH procedure. In flight; they discovered the error and diverted to the nearest suitable airport.

Narrative: On the ground; we had a CARGO BTL LO message. We incorrectly followed the QRH procedure for the event. We did not realize that we had done so until we were [en route]. The correct QRH procedure was followed once the error was realized; it called for a landing at the nearest suitable airport. The flight crew and the Dispatcher came to a mutual decision on the nearest suitable airport. The diversion and subsequent continuation of the flight was uneventful. In flight when the Captain was writing the procedure up; something did not seem right. On the ground; we had a lengthy maintenance delay because a passenger's oxygen mask had dropped. After the very lengthy delay; we had an APU BATTERY CHARGER status message that popped up indicating that the APU battery was not charging. The message ended up going away; but the memory of that message was still ingrained in my mind when we taxied out for takeoff. Just prior to the end of the runway; the caution message popped up. We both looked at the message and I was of the opinion that either the bottle had leaked or the message was an error. I brought out the QRH and looked up the CARGO BTL message under the Fire Protection Tab. I noticed that it was the last message in the index of that tab. Once I saw that it was on the last page; I went to the last page of the Fire Protection QRH section and started reading at the top. I started reading at the top without really noticing the title of the QRH procedure. I was able to see that I was on the last page and didn't realize that there were multiple QRH procedures on the same page. We followed the procedure for an APU BOTTLE LO not CARGO BOTTLE LO; the result of the procedure was that we determined that an error message had occurred and since we had already blocked out we both felt comfortable proceeding. Reading the title of the checklist aloud or having a chart on the QRH that explains the message more in depth might have told us that were looking at the wrong message.

Data retrieved from NASA's ASRS site as of April 2012 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.