B757 first officer reported loss of left pack on approach; followed by flaps locking out at 20 degrees. Procedures were run for both anomalies; an emergency was declared; and a normal landing ensued.

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Attributes
ACN	1082213
Time
Date	201304
Local Time Of Day	1201-1800
Place
Locale Reference	A90.TRACON
State Reference	NH
Environment
Flight Conditions	VMC
Aircraft 1
Make Model Name	B757-200
Operating Under FAR Part	Part 121
Flight Phase	Initial Approach
Flight Plan	IFR
Component
Aircraft Component	Air Conditioning and Pressurization Pack
Person 1
Function	First Officer Pilot Not Flying
Qualification	Flight Crew Air Transport Pilot (ATP)
Events
Anomaly	Aircraft Equipment Problem Critical

Narrative:

On approach left pack shut down; followed QRH procedure and continued; after calling for flaps 25; flaps locked out at 20 degrees. Pilot flying executed visual go around with flaps 20; declared emergency. Followed QRH procedure for trailing edge disagree and landed with flaps 20. No further problems and we proceeded to the gate.

Original NASA ASRS Text

Title: B757 First Officer reported loss of left pack on approach; followed by flaps locking out at 20 degrees. Procedures were run for both anomalies; an emergency was declared; and a normal landing ensued.

Narrative: On approach left pack shut down; followed QRH procedure and continued; after calling for flaps 25; flaps locked out at 20 degrees. Pilot flying executed visual go around with flaps 20; declared emergency. Followed QRH procedure for trailing edge disagree and landed with flaps 20. No further problems and we proceeded to the gate.

Data retrieved from NASA's ASRS site as of July 2013 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.