B747-400
Flight Crew Instrument; Flight Crew Air Transport Pilot (ATP); Flight Crew Multiengine
Aircraft Equipment Problem Less Severe; Flight Deck / Cabin / Aircraft Event Smoke / Fire / Fumes / Odor
Aircraft Equipment Problem Dissipated; Flight Crew Overcame Equipment Problem; General Maintenance Action
Aircraft
I was the PF (Pilot Flying). At approximately 1;000 feet the 'SMOKE CREW REST' EICAS came on. We continued to fly the airplane while the DH (Dead heading) crew members onboard examined the crew rest area. The alarm was going off on the right side. About 3;000 feet the alarm and EICAS message was extinguished. There was no smell nor visible smoke. The DH crew member noted there was a musky smell. We continued on with the flight with no other problems.
Right after liftoff I began to smell a 'dirty sock' smell that I've associated with mildew buildup in the pack system. At less than 1;000 feet; we began to hear a smoke detector going off. Due to the volume it was hard to determine where it was coming from. We were also still at 15 degree plus pitch; so it was initially hard to get out of our seats in the back. FO came out of the cockpit and said it was in the bunk area. CA; FO and I immediately went into the bunk area. I went forward and grabbed a fire extinguisher off the wall to be ready to pass it forward if needed. The Smoke Detector in the right side was going off. No smoke was seen or smelled but the odor from before persisted. They checked for heat sources and found none. FO reported the findings up to the CA and the climbout continued. CA; FO and I continued to check the area. We inspected the areas behind the bunks through the blowout hatches; the linen closets and felt all the floors and walls again for heat. CA went below onto the main deck to inspect for any signs of smoke and found none. All this was passed up to the crew. The Smoke Detector had silenced after about a minute on its own and the Caution had extinguished as well. The crew elected to continue the flight since it appeared to be a false alarm. The smell from the initial climb also began to dissipate as time passed. The crew stated that they wrote up the issues for [destination] Maintenance to work. Suggestions: Aircraft packs and ducting need to be cleaned on a regular basis.
B747-400 flight crew reported SMOKE EICAS message accompanied Crew Rest Alarm activation. No evidence of smoke/fire; they proceeded on with the flight.