B767 Captain and Dispatcher reported misunderstanding of the Dry Ice Supplemental Procedures in the QRH; but a Supervisor found a supporting document that provided further information regarding the MEL's restrictions on dry ice for the flight to continue safely.
Synopsis
B767 Captain and Dispatcher reported misunderstanding of the Dry Ice Supplemental Procedures in the QRH; but a Supervisor found a supporting document that provided further information regarding the MEL's restrictions on dry ice for the flight to continue safely.
Narrative
This morning we were assigned Aircraft X. It had MEL 21-XX-XX-XX. Shortly before pushback we received an ACARS message that we were flying under supplemental dry ice procedures. At this point we reviewed the Supplemental Dry Ice Procedures in the QRH. The top note on [the] page addresses the scenario forced by the MEL where the Compartment Temperature Controls automatic function is inoperative; and the switches can be placed in the OFF position. We misread/missed this step while reviewing the procedure. Things didn't make sense to us after misreading the step so I called the Supervisor for clarification; and she prompted me to call our Dispatcher and update him. The Supervisor sent me a copy of document which had wording matching the QRH wording we missed. This document provided the relief we needed and we departed after the 25-minute delay; with the Supplemental Dry Ice Procedure in effect. Once we landed in ZZZ1 I had a notification from the Supervisor highlighting the note in the QRH we misread.We misread the procedure/missed the note that provided relief for the MEL. I've been flying ZZZ1 this month and Supplemental Dry Ice is often added to the flight before block out. Every time they add it I review the procedure in the QRH with my FO. Maybe I read it too fast given how very familiar" with the steps I was. In the end; we missed that note and delayed block out until we were satisfied we were operating safely and legally.Suggestions: Checklist discipline. Read slowly like you've never used it before regardless of how familiar with the steps I am. Perhaps adding a note in the MEL indicating Supplemental Dry Ice Procedures are allowed/unaffected by the MEL."
Second reporter narrative
At XA:38 I approved dry ice supplement procedures for dry ice. At XA:42 I sent the ACARS announcing that dry ice supplement procedures were in affect for the flight to the crew. At XC:36 was advised by personnel the crew had an issue with the dry ice supplemental procedures in the QRH manual and the MEL 21-XX-XX-XX in the aircraft setting that would reduce the amount of dry ice. The Supervisor found MEL considerations for 767 QRH supplemental dry ice procedures (B767)" in which the procedures setting would include more dry ice than the normal limits with a dry ice supplemental waiver. Crew; the Supervisor; and I spoke before the departure and we both were comfortable and consider the flight safe for release.Suggestions: Rewrite the MEL to point to the QRH or when handle dry ice/lives above normal quantity that you can carry dry ice above the normal limits due to the document and/or QRH. Crew notified me and we discussed between the Dispatcher and Supervisor. Found document for relief. Supervisor helped clarify the QRH with the document."
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Source: NASA Aviation Safety Reporting System (public domain). Reports are voluntary submissions and are not verified by NASA.