SDR UIEA2020122102600

Service difficulty report · Aap · Boeing 767306

Difficulty date: December 19, 2020
Submitted: December 21, 2020
Operation: Air carrier
Aircraft: N1321A
Make and model: Boeing 767306
Aircraft serial: 27957
Aircraft time: 87,722 hours, 20,998 cycles
System (JASC): 2150 · Cabin Cooling System
Part: Aap
Condition: Unknown
Stage of operation: CL
How discovered: O
Nature of condition: O
Precautionary procedure: O

As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.

What was found

AIRCRAFT PACKS EXCESSIVELY LOUD, W/BOTH PACKS ON THEY HAVE A LOUD WHISTLE. DURING DEPARTURE EVEN WITH VOLUME ALL THE WAY UP. ATC COULD BARELY BE UNDERSTOOD AND PILOTS HAD TO YELL AT EACH OTHER. CONT-WHISTLE WHENT AWAY AS WE CLIMBED THROUGH FL250, WHICH DROPPED NOISE LEVEL GREATLY. PERFORMED ENGINE RUN, IAW 767 M/M 71-00-00 & OPERATION OF BOTH PACKS IAW 767 M/M 21-00-00 & FOUND BOTH PACKS TO OPERATE NORMAL WITH NO WHISTLE. TALKED IN A NORMAL VOICE USING RADIO'S, NO DEFECTS NOTED AT THIS TIME.