Pilot reported that a loss of pressurization resulted in an expedited descent.

Attributes
ACN	1726403
Time
Date	202002
Local Time Of Day	0601-1200
Place
Locale Reference	ZZZ.ARTCC
State Reference	US
Environment
Flight Conditions	IMC
Light	Daylight
Aircraft 1
Make Model Name	Light Transport Low Wing 2 Turbojet Eng
Operating Under FAR Part	Part 91
Flight Phase	Descent
Flight Plan	IFR
Component
Aircraft Component	Pressurization System
Person 1
Function	First Officer Pilot Not Flying
Qualification	Flight Crew Multiengine Flight Crew Instrument Flight Crew Air Transport Pilot (ATP)
Experience	Flight Crew Last 90 Days 80 Flight Crew Total 7250 Flight Crew Type 25
Person 2
Function	Pilot Flying Captain
Qualification	Flight Crew Instrument Flight Crew Multiengine Flight Crew Air Transport Pilot (ATP)
Experience	Flight Crew Last 90 Days 60 Flight Crew Total 4200 Flight Crew Type 300
Events
Anomaly	Aircraft Equipment Problem Critical

Narrative:

I was acting as sic on a trip from ZZZ-ZZZ1. We were at FL400 and given an initial descent to FL350 with an expedited descent through FL380. When the captain retarded the throttles we received a caution light alerting us that we had a pressurization issue. We alerted ATC that we needed to continue our descent to 15;000 ft. The frequency was crowded and ATC did not acknowledge our request for lower. I broadcast for a 3rd time and another pilot told ATC 'someone is [requesting priority handling]; everyone standby.' at that point we were able to convey our [request] to ATC and were issued a continued descent down to FL240. Before leveling off; we were given a descent down to our requested 15;000 ft. Once we got lower the aircraft pressure stabilized and we were able to continue the flight with no other issues. The aircraft; nor passengers or crew were damaged or harmed during this event.

Original NASA ASRS Text

Title: Pilot reported that a loss of pressurization resulted in an expedited descent.

Narrative: I was acting as SIC on a trip from ZZZ-ZZZ1. We were at FL400 and given an initial descent to FL350 with an expedited descent through FL380. When the Captain retarded the throttles we received a caution light alerting us that we had a pressurization issue. We alerted ATC that we needed to continue our descent to 15;000 ft. The frequency was crowded and ATC did not acknowledge our request for lower. I broadcast for a 3rd time and another pilot told ATC 'Someone is [requesting priority handling]; everyone standby.' At that point we were able to convey our [request] to ATC and were issued a continued descent down to FL240. Before leveling off; we were given a descent down to our requested 15;000 ft. Once we got lower the aircraft pressure stabilized and we were able to continue the flight with no other issues. The aircraft; nor passengers or crew were damaged or harmed during this event.

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.