B767-300 and 300 ER
Flight Crew Air Transport Pilot (ATP)
Flight Crew Last 90 Days 62; Flight Crew Total 10000; Flight Crew Type 4062
Situational Awareness
Aircraft Equipment Problem Less Severe; Deviation - Track / Heading All Types; Deviation / Discrepancy - Procedural Published Material / Policy; Deviation / Discrepancy - Procedural Clearance
Aircraft Equipment Problem Dissipated; Flight Crew Executed Go Around / Missed Approach; General Declared Emergency
Human Factors; Aircraft
Initially made aware of a stuck mike by Center at FL360. After much troubleshooting we were unable to resolve the issue. At best we had very sporadic communication capability. With the assistance of some airplanes in the area we were cleared to 11;000 FT. After having some success with Approach we were cleared to join the localizer at 3;000 FT. There was no clearance for the approach or landing. Prior to glide slope intercept with the comm back to zero; I decided to discontinue the approach. We set the transponder to 7600 at the First Officer's suggestion; turned left off the localizer.  I was planning to orbit west of the field; try to re-establish communications or review lost comm procedures if that failed and remain in sight of the Tower. Approach was able to communicate to us that we were cleared the visual to 35L and cleared to land. We complied. Communication remained reliable for the approach; landing; and taxi.
We became aware of a stuck mike shortly after our TOD point. After changing freqs and trying guard; eventually it was determined that our aircraft had the stuck mike. From that point we were high on our descent profile. As we expedited our descent the communications seamed mostly normal. However; after intercepting the localizer we could not raise Approach Control to get clearance to land. We were on final; 5 miles from the airport. We decided to not continue the approach without clearance. Since we had no further clearance; we squawked 7600 and started a left turn. Then our communications came back and we were able to get clearance to land from Approach Control; just in case we lost comm again. It seemed we did lose Approach Control again; however when we switched to the Tower on our own communications with the Tower were normal.
B767 flight crew experiences an intermittent stuck mic during descent; approach and missed approach before regaining communications and landing normally.