B737-700 first officer reports lost communication with ATC during the hhood 2 RNAV arrival to pdx. T...

Narrative:

We were descending via the hhood 2 RNAV arrival into pdx. ATC asked us to try and call an aircraft on 121.50 that was having an emergency. I tried to contact them but got no response. Captain called center to tell them we were unable to contact [the aircraft] but had a hard time contacting [center]. After some more effort; he was able to contact [center] and [center] switched us to approach; I believe. We were never able to contact ATC again on that frequency or any other that we tried. We both tried on both radios with no success. We checked our intercom switches and handheld microphones for stuck mic also. We were coming up on the end of the arrival at shafr. I told him we need to execute the lost communication procedure on the arrival; which stated for a west operation for runway 28 to proceed from shafr to naciy and execute the ILS to 28R. The captain squawked 7600 and we did exactly that and landed on 28R. We tried tower; ground; approach; etc. All the way in on both radios with no success. After landing and clearing the runway; we taxied to the gate but were never able to contact anyone on either radio. I don't know what maintenance was able to find wrong; but I have read some things about the aftermarket yolk switches failing or having communication problems. I'm not sure if it was a failure of a switch or radio etc.; but if it is something that is happening frequently it needs to be looked at.

Original NASA ASRS Text

Title: B737-700 First Officer reports lost communication with ATC during the HHOOD 2 RNAV arrival to PDX. The HHOOD 2 lost communication procedure is complied with and the crew lands at PDX and taxis to the gate without communication.

Narrative: We were descending via the HHOOD 2 RNAV Arrival into PDX. ATC asked us to try and call an aircraft on 121.50 that was having an emergency. I tried to contact them but got no response. Captain called Center to tell them we were unable to contact [the aircraft] but had a hard time contacting [Center]. After some more effort; he was able to contact [Center] and [Center] switched us to Approach; I believe. We were never able to contact ATC again on that frequency or any other that we tried. We both tried on both radios with no success. We checked our intercom switches and handheld microphones for stuck mic also. We were coming up on the end of the arrival at SHAFR. I told him we need to execute the lost communication procedure on the arrival; which stated for a west operation for Runway 28 to proceed from SHAFR to NACIY and execute the ILS to 28R. The Captain squawked 7600 and we did exactly that and landed on 28R. We tried Tower; Ground; Approach; etc. all the way in on both radios with no success. After landing and clearing the runway; we taxied to the gate but were never able to contact anyone on either radio. I don't know what Maintenance was able to find wrong; but I have read some things about the aftermarket yolk switches failing or having communication problems. I'm not sure if it was a failure of a switch or radio etc.; but if it is something that is happening frequently it needs to be looked at.

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	1187363
Time
Date	201407
Local Time Of Day	0601-1200
Place
Locale Reference	PDX.Airport
State Reference	OR
Environment
Flight Conditions	Mixed
Light	Daylight
Aircraft 1
Make Model Name	B737-700
Operating Under FAR Part	Part 121
Flight Phase	Descent
Route In Use	STAR HHOOD 2
Flight Plan	IFR
Component
Aircraft Component	VHF
Person 1
Function	First Officer Pilot Flying
Experience	Flight Crew Last 90 Days 177
Events
Anomaly	Aircraft Equipment Problem Less Severe

B737-700 first officer reports lost communication with ATC during the hhood 2 RNAV arrival to pdx. The hhood 2 lost communication procedure is complied with and the crew lands at pdx and taxis to the gate without communication.