Emb-145 first officer at FL320 detected a pressure change in his ears and noted on the EICAS that th...

Narrative:

During cruise flight at FL320 I had noticed a physiological change in pressurization. It had drawn my attention to the EICAS and noticed that the differential pressure was rising as well as the cabin altitude. I had verbalized the issue and called for the oxygen masks. I had put my oxygen mask on as well as the captain and then performed the memory items for the emergency descent. We had notified the flight attendant and ATC of our intentions while performing several duties. Once we had leveled off at 10;000 feet; we decided on an alternate and landed uneventfully and taxied to the gate without incident. The aircraft had approximately 25 passengers on it which is light in relation to standard operations. During the descent the aircraft had pitched down excessively to maintain the 240 knots as stated by procedure. The captain had reduced the descent to 220 knots because he stated that the tail was shaking. The aircraft was never out of control however this event varied from the suggested emergency descent procedure.

Original NASA ASRS Text

Title: EMB-145 First Officer at FL320 detected a pressure change in his ears and noted on the EICAS that the cabin altitude was rising. Oxygen masks were donned and an emergency descent initiated with a level off at 10;000 feet. The crew elected to divert to a suitable alternate.

Narrative: During cruise flight at FL320 I had noticed a physiological change in pressurization. It had drawn my attention to the EICAS and noticed that the differential pressure was rising as well as the cabin altitude. I had verbalized the issue and called for the oxygen masks. I had put my oxygen mask on as well as the captain and then performed the memory items for the emergency descent. We had notified the flight attendant and ATC of our intentions while performing several duties. Once we had leveled off at 10;000 feet; we decided on an alternate and landed uneventfully and taxied to the gate without incident. The aircraft had approximately 25 passengers on it which is light in relation to standard operations. During the descent the aircraft had pitched down excessively to maintain the 240 knots as stated by procedure. The captain had reduced the descent to 220 knots because he stated that the tail was shaking. The aircraft was never out of control however this event varied from the suggested emergency descent procedure.

Data retrieved from NASA's ASRS site 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.

Attributes
ACN	1309087
Time
Date	201511
Local Time Of Day	1801-2400
Place
Locale Reference	ZZZ.Airport
State Reference	US
Environment
Flight Conditions	VMC
Light	Night
Aircraft 1
Make Model Name	EMB ERJ 145 ER/LR
Operating Under FAR Part	Part 121
Flight Phase	Cruise
Flight Plan	IFR
Component
Aircraft Component	Pressurization Control System
Person 1
Function	First Officer Pilot Not Flying
Qualification	Flight Crew Air Transport Pilot (ATP)
Events
Anomaly	Aircraft Equipment Problem Less Severe Deviation - Procedural Published Material / Policy

Emb-145 first officer at FL320 detected a pressure change in his ears and noted on the EICAS that the cabin altitude was rising. Oxygen masks were donned and an emergency descent initiated with a level off at 10;000 feet. The crew elected to divert to a suitable alternate.