Medium Transport; High Wing; 2 Turboprop Eng
Troubleshooting
Aircraft Equipment Problem Less Severe; Inflight Event / Encounter Weather / Turbulence
Flight Crew Diverted; General Release Refused / Aircraft Not Accepted
Aircraft; MEL
[Flight] was operating with a deferred Number 2 Bleed Valve. Due to this; PACK Number 2 was not operating in flight. On approach into JHM; weather had dropped below minimum required visibility; so a missed approach was executed. At the time; conditions were fairly smooth with occasional light chop and an overcast layer above our altitude. During the missed approach procedure; the Flight Attendant contacted the flight deck to advise that passengers had been complaining about high temperatures since soon after departure from [departure airport] and were requesting that air conditioning be turned on. Upon checking the cabin temperature gauge; we found it was reading 30 degrees Celsius or more despite appropriate settings. The Flight Attendant also advised that two passengers had vomited. After checking the weather in JHM; we found that it had further deteriorated and a diversion was necessary. I addressed the passengers; stating that we would be diverting to our filed alternate. I also communicated our awareness of the air conditioning problem and that we would be landing in ten minutes. We continued the diversion to [our alternate] and landed safely. After consulting with all crewmembers; I decided that we could not continue further passenger carrying operations safely due to high cabin temperatures in flight. Due to daytime weather conditions in Hawai'i; operations with a single PACK do not provide adequate cooling to the aircraft interior. This especially true when the PACK not operating is the right hand side Number 2 unit; as Number 2 is primary for cooling the passenger cabin.
Air carrier flight crew was operating an aircraft with one of two PACKS deferred. The cabin temperature was approximately 30 degrees C. After diverting to their alternate airport; the flight crew refused the aircraft due to high cabin temperatures.