Heavy air carrier first officer reported communication failure between foreign maintenance and compa...

Narrative:

1. On departure from ZZZZ; around 8;000' the cabin altitude indication turned amber. 2. Around 15;000' the cabin altitude turned red; and there was a master warning EICAS message ( [ ] cabin altitude ) with the corresponding aural alerts 3. Crew performed the associated checklist for cabin altitude 4. An emergency was declared and the crew descended 10;000' 5. International relief officer contacted dispatch on the sat radio 6. Crew held; completed checklists; reviewed performance numbers; and set-up to return to ZZZZ 7. Crew received vectors for the ILS xxr into ZZZZ; and landed no further issues. 8. Maintenance met the airplane at parking spot X. 1.prior to handing out paperwork; the captain noticed a status message - 'outflow valve aft' 2. Maintenance came on the airplane and worked the issue; and ended up writing one MEL (MEL 21.31.03.03.02) 3. We departed with a MEL on the aft outflow valve; and ultimately ended up with the airplane not pressurizing correctly 4. After noticing the issue; followed by the master warning; the crew decided the best course of action was to return . Better communication between the maintenance team in ZZZ and the mechanics in ZZZZ. There seemed to have been a lapse in communication between the two groups. The ZZZZ mechanics looked to be rushed; and appeared to be struggling with accomplishing the MEL correctly.

Original NASA ASRS Text

Title: Heavy Air Carrier First Officer reported communication failure between foreign maintenance and company maintenance team resulting in failure to repair aircraft.

Narrative: 1. On departure from ZZZZ; around 8;000' the cabin altitude indication turned amber. 2. Around 15;000' the cabin altitude turned red; and there was a Master Warning EICAS message ( [ ] CABIN ALTITUDE ) with the corresponding aural alerts 3. Crew performed the associated checklist for CABIN ALTITUDE 4. An emergency was declared and the crew descended 10;000' 5. IRO contacted dispatch on the SAT radio 6. Crew held; completed checklists; reviewed performance numbers; and set-up to return to ZZZZ 7. Crew received vectors for the ILS XXR into ZZZZ; and landed no further issues. 8. Maintenance met the airplane at parking spot X. 1.Prior to handing out paperwork; the Captain noticed a status message - 'Outflow Valve Aft' 2. Maintenance came on the airplane and worked the issue; and ended up writing one MEL (MEL 21.31.03.03.02) 3. We departed with a MEL on the AFT outflow valve; and ultimately ended up with the airplane not pressurizing correctly 4. After noticing the issue; followed by the Master Warning; the crew decided the best course of action was to return . Better communication between the maintenance team in ZZZ and the mechanics in ZZZZ. There seemed to have been a lapse in communication between the two groups. The ZZZZ mechanics looked to be rushed; and appeared to be struggling with accomplishing the MEL correctly.

Data retrieved from NASA's ASRS site 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.

Attributes
ACN	1761108
Time
Date	202009
Local Time Of Day	1201-1800
Place
Locale Reference	ZZZZ.ARTCC
State Reference	US
Aircraft 1
Make Model Name	Commercial Fixed Wing
Operating Under FAR Part	Part 91
Flight Phase	Climb
Flight Plan	IFR
Component
Aircraft Component	Pressurization Outflow Valve
Person 1
Function	First Officer
Qualification	Flight Crew Air Transport Pilot (ATP) Flight Crew Instrument Flight Crew Multiengine
Events
Anomaly	Aircraft Equipment Problem Critical Deviation - Procedural Maintenance Deviation - Procedural Published Material / Policy

Heavy air carrier first officer reported communication failure between foreign maintenance and company maintenance team resulting in failure to repair aircraft.