SDR ASAA2023050143082

Service difficulty report · Plenum · Boeing 737990ER

Difficulty date: May 1, 2023
Submitted: May 3, 2023
Operation: Air carrier
Aircraft: N413AS
Make and model: Boeing 737990ER
Aircraft serial: 35205
Aircraft time: 37,562 hours, 11,812 cycles
System (JASC): 2150 · Cabin Cooling System
Part: Plenum
Part number: 22156292
Condition: Damaged
Location: Right Ecs Bay
Stage of operation: IN
How discovered: V
Nature of condition: O
Precautionary procedure: K

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

What was found

WHILE WORKING ASA TC # 78121000 PRIMARY AND SECONDARY HEAT EXCHANGERS - RESTORATION FOUND RIGHT SIDE PRIMARY HEAT EXCHANGER PLENUM/DIFFUSER FLAPPER DOOR DAMAGED. GROUNDED - YES. REMOVED RIGHT SIDE PRIMARY HEAT EXCHANGER AND PLENUM/DIFFUSER ASSY REF B737-900 AMM 21-51-03-000-805-002. REPLACED R/H PRIMARY HEAT EXCHANGER PLENUM & DIFFUSER ASSY & REINSTALLED REF AMM 21-51-03-804-002 STEP 3.H.(1) - 3.I (17).