Narrative:

I worked on a B777 aircraft all day. It was scheduled for ETOPS flight on a trip early in the day and then pushed back to two other trips later in the day. The primary problem with this airplane was a popped delta-P [red indicator] on the center hydraulic system return filter in the right wheel well. There are two packing [O-rings] in the illustrated parts catalog (ipc) chapter 29-11-45 with invalid part numbers (P/north). The first packing is for the [hydraulic return] filter bowl. In ipc 29-11-45; it can be found in item 30. The packing is identified as NAS1601-430; which doesn't break to any company [stores] P/north. There are no alternate parts listed.I consulted with domestic maintenance control support and they found the wing hydraulic return filters in ipc chapter 29-11-44 have a comparable o-ring with the P/north NAS1611-430; which is stocked by our air carrier. I used this packing on the [center hydraulic system] filter bowl. The second o-ring packing with an invalid P/north belongs to the delta-P indicator. The delta-P indicator wouldn't reset. It is sealed with two packing's (found in ipc 29-11-45 items #55 and #60). Item #60 is P/north NAS1601-014; which again; doesn't break to our stores P/north. Maintenance control support crossed-referenced that P/north in the ipc and found NAS1601-014 was an alternate part for NAS1611-014 in ipc 27-31-09. This packing was stocked locally and I used it as a substitute for NAS1601-014.one of the items I generated [and wrote-up]; was for the popped delta-P indicator on the center hydraulic system return filter. This [red indicator] would not reset. The delta-P can be found in ipc 29-11-45; item 135. Initially; our company stores parts computer showed it as being in-stock locally. I removed the delta-P indicator [body] based on this information. It was later learned the delta-P indicator body part was not in stock. Supervisor suggested I defer the reset of the popped delta-P [red indicator] using a non-essential function (nef) deferral. Myself; my coworker; and the two lead mechanics involved declined to use this [type of] deferral. Management then agreed to call and sign for the nef deferral.I made two [write-up] items in the logbook to cover this scenario. The first [write-up] for the delta-P [red indicator] not resetting (log report X). The second [write-up] was for reinstalling the malfunctioning delta-P [red pin indicator] with new [O-ring] packing's (log report Y). I signed for [log report Y]; while supervisor signed for the nef deferral of log report X. The plane was released and departed for an international destination. There the nef deferral [log report X] was cleared without any maintenance being accomplished. Instead; international maintenance control used my log report Y; the re-installation of the delta-P [indicator body]; as the authority to clear the log X nef deferral [for the popped indicator].

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Original NASA ASRS Text

Title: A Line Mechanic reported making two logbook write-ups for a popped Delta-P indicator pin on the center hydraulic system return filter of a B-777 ETOPS aircraft. First write-up for popped indicator was deferred by a Maintenance Supervisor as Non-Essential Function (NEF). The second write-up signed-off by Mechanic. Later; Maintenance Control cleared the NEF deferral using the Line Mechanic's sign-off as authority.

Narrative: I worked on a B777 aircraft all day. It was scheduled for ETOPS flight on a trip early in the day and then pushed back to two other trips later in the day. The primary problem with this airplane was a popped Delta-P [red indicator] on the center hydraulic system return filter in the right wheel well. There are two packing [O-rings] in the Illustrated Parts Catalog (IPC) chapter 29-11-45 with invalid Part Numbers (P/N). The first packing is for the [hydraulic return] filter bowl. In IPC 29-11-45; it can be found in item 30. The packing is identified as NAS1601-430; which doesn't break to any company [Stores] P/N. There are no alternate parts listed.I consulted with Domestic Maintenance Control support and they found the wing hydraulic return filters in IPC chapter 29-11-44 have a comparable O-ring with the P/N NAS1611-430; which is stocked by our air carrier. I used this packing on the [center hydraulic system] filter bowl. The second O-ring packing with an invalid P/N belongs to the Delta-P indicator. The Delta-P indicator wouldn't reset. It is sealed with two packing's (found in IPC 29-11-45 items #55 and #60). Item #60 is P/N NAS1601-014; which again; doesn't break to our Stores P/N. Maintenance Control support crossed-referenced that P/N in the IPC and found NAS1601-014 was an alternate part for NAS1611-014 in IPC 27-31-09. This packing was stocked locally and I used it as a substitute for NAS1601-014.One of the items I generated [and wrote-up]; was for the popped Delta-P indicator on the center hydraulic system return filter. This [red indicator] would not reset. The Delta-P can be found in IPC 29-11-45; item 135. Initially; our company Stores parts computer showed it as being in-stock locally. I removed the Delta-P indicator [body] based on this information. It was later learned the Delta-P indicator body part was not in stock. Supervisor suggested I defer the reset of the popped Delta-P [red indicator] using a Non-Essential Function (NEF) deferral. Myself; my coworker; and the two lead mechanics involved declined to use this [type of] deferral. Management then agreed to call and sign for the NEF deferral.I made two [write-up] items in the logbook to cover this scenario. The first [write-up] for the Delta-P [red indicator] not resetting (log report X). The second [write-up] was for reinstalling the malfunctioning Delta-P [red pin indicator] with new [O-ring] packing's (log report Y). I signed for [log report Y]; while Supervisor signed for the NEF deferral of log report X. The plane was released and departed for an international destination. There the NEF deferral [log report X] was cleared without any maintenance being accomplished. Instead; International Maintenance Control used my log report Y; the re-installation of the Delta-P [indicator body]; as the authority to clear the log X NEF deferral [for the popped indicator].

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.