Narrative:

First officer (first officer); pilot flying (PF). Second leg of duty period after flying same pairing last three days prior with good rest and circadian patterning. MEL had us operate the equipment cooling in standby (stby) with no other procedures or limitations; signaling supply fan to run versus the normal equipment fan. This MEL should not have been of consequence. After checking in with departure; turned off right air condition (AC) pack to reduce cockpit noise level per aircraft operating manual (aom) supplemental procedures. Was very busy during climb to FL320 with multiple ATC altitude assignments; frequency changes and light to moderate turbulence. Cockpit temperature climbed to 87 degrees with no other indications; so responded by moving flight deck temperature controller to man with good results. Reaching top of climb; confirmed that action seemed appropriate by reviewing QRH. Though not annunciated; looked at flight deck temperature checklist as a reference. Filed altitude was FL340. Was subsequently cleared to FL380 for better ride; which resulted in smooth conditions.[we]; received a cabin altitude warning and EICAS. First instinct was to immediately turn on right AC pack; and first officer called for checklist. We donned oxygen and ran cabin altitude procedure. It was immediately apparent that the cabin altitude was controllable at 10;000 feet indicated and descending; so called the checklist complete at the appropriate branch. We left our oxygen masks on until cabin descended to max differential at 6;700 feet cabin altitude; level FL380. With situation well under control; determined no change in altitude or request for ATC assistance was deemed necessary. Entered faults in aircraft logbook; reported to maintenance via ACARS; and continued normally to destination.upon initial reflection; I was happy that I thought of turning on the right AC pack immediately upon receiving the cabin altitude warning. However; upon further review of aom single pack operations; it may have been a better course of action to turn on the other pack when we first had the temperature control valve fluctuation. The aom states 'in the event of any non-normal condition and/or EICAS message(s) concerning pressurization; pneumatics; ice protection; or air conditioning; prior to performing the appropriate procedure: both pack selector switches...on'. First officers are a valuable resource; and as such; perhaps I could have asked him to look over the temperature control situation in greater detail to see if he had additional inputs prior to receiving the warning.

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Original NASA ASRS Text

Title: B767 flight crew reported receiving a cabin altitude EICAS warning while in cruise.

Narrative: First officer (FO); Pilot Flying (PF). Second leg of duty period after flying same pairing last three days prior with good rest and circadian patterning. MEL had us operate the Equipment Cooling in standby (STBY) with no other procedures or limitations; signaling supply fan to run versus the normal equipment fan. This MEL should not have been of consequence. After checking in with departure; turned off Right Air Condition (AC) pack to reduce cockpit noise level per Aircraft Operating Manual (AOM) supplemental procedures. Was very busy during climb to FL320 with multiple ATC altitude assignments; frequency changes and light to moderate turbulence. Cockpit temperature climbed to 87 degrees with no other indications; so responded by moving FLT DECK temperature controller to MAN with good results. Reaching top of climb; confirmed that action seemed appropriate by reviewing QRH. Though not annunciated; looked at Flight Deck Temperature checklist as a reference. Filed altitude was FL340. Was subsequently cleared to FL380 for better ride; which resulted in smooth conditions.[We]; received a CABIN ALTITUDE warning and EICAS. First instinct was to immediately turn on Right AC pack; and FO called for checklist. We donned oxygen and ran CABIN ALTITUDE procedure. It was immediately apparent that the cabin altitude was controllable at 10;000 feet indicated and descending; so called the checklist complete at the appropriate branch. We left our oxygen masks on until cabin descended to max differential at 6;700 feet cabin altitude; level FL380. With situation well under control; determined no change in altitude or request for ATC assistance was deemed necessary. Entered faults in aircraft logbook; reported to maintenance via ACARS; and continued normally to destination.Upon initial reflection; I was happy that I thought of turning on the Right AC pack immediately upon receiving the Cabin Altitude warning. However; upon further review of AOM Single Pack Operations; it may have been a better course of action to turn on the other pack when we first had the temperature control valve fluctuation. The AOM states 'In the event of any non-normal condition and/or EICAS message(s) concerning pressurization; pneumatics; ice protection; or air conditioning; prior to performing the appropriate procedure: BOTH PACK SELECTOR SWITCHES...ON'. First officers are a valuable resource; and as such; perhaps I could have asked him to look over the temperature control situation in greater detail to see if he had additional inputs prior to receiving the warning.

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.