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Air carrier medium large transport had radio communication problems aggravated by altitude deviation and using aerial piracy code instead of lost communication code.
| Attributes | |
| ACN | 191193 |
| Time | |
| Date | 199110 |
| Day | Mon |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | airport : chs |
| State Reference | SC |
| Altitude | msl bound lower : 10000 msl bound upper : 10600 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zjx tower : zjx |
| Operator | common carrier : air carrier |
| Make Model Name | Medium Large Transport, Low Wing, 2 Turbojet Eng |
| Flight Phase | climbout : intermediate altitude |
| Route In Use | enroute : on vectors |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp pilot : commercial pilot : flight engineer |
| Experience | flight time last 90 days : 150 flight time total : 13000 flight time type : 2100 |
| ASRS Report | 191193 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 220 flight time total : 4600 flight time type : 350 |
| ASRS Report | 191196 |
| Events | |
| Anomaly | aircraft equipment problem : less severe altitude deviation : overshoot non adherence : clearance |
| Independent Detector | other controllera other flight crewa |
| Resolutory Action | controller : issued new clearance flight crew : overcame equipment problem |
| Consequence | Other |
| Supplementary | |
| Primary Problem | Aircraft |
| Air Traffic Incident | Pilot Deviation |
Narrative:
After takeoff at chs and switching to departure we lost communication. Went back to tower and after about 2 mins we reestablished communication with tower. Tower gave us a vector to intercept outbound course and climb to 10000 ft MSL. Autoplt was on at 2000 ft MSL (because of communication problems). The flight annunciator panel (FMA) has VNAV climb and altitude arm annunciated. 10000 ft was in the altitude window of the dfgc. Tower switched us to jax center but no communication with jax. We then tried tower but no communication. Then went back to jax center. We tried captain on #1 radio, first officer on #1 radio, captain on #2 radio, first officer on #2 radio. I decided to squawk 7600. As I was changing the squawk to 7600 I noticed the aircraft climbing through 10000 ft with VNAV level on the FMA. It was first officer's leg so I told him to level off which he did. However, we did go to 10500 ft. At that time jax center reached us and cleared us to 14000 ft. Jax center also wondered if we had another problem and I noticed 7500 in the transponder. I told them no we did not have a problem. I had inadvertently put 7500 instead of 7600 in the transponder or it had not been set in the notch (the TCASII transponders will change codes if not set exactly right -- another led wonder). After landing in atlanta, maintenance told us that a relay was sticking in communication 1 that would blank out reception in all the radios. After not using communication 1 for an undetermined period of time it would unstick and communication could be restored.
Original NASA ASRS Text
Title: ACR MLG HAD RADIO COM PROBLEMS AGGRAVATED BY ALTDEV AND USING AERIAL PIRACY CODE INSTEAD OF LOST COM CODE.
Narrative: AFTER TKOF AT CHS AND SWITCHING TO DEP WE LOST COM. WENT BACK TO TWR AND AFTER ABOUT 2 MINS WE REESTABLISHED COM WITH TWR. TWR GAVE US A VECTOR TO INTERCEPT OUTBOUND COURSE AND CLB TO 10000 FT MSL. AUTOPLT WAS ON AT 2000 FT MSL (BECAUSE OF COM PROBLEMS). THE FLT ANNUNCIATOR PANEL (FMA) HAS VNAV CLB AND ALT ARM ANNUNCIATED. 10000 FT WAS IN THE ALT WINDOW OF THE DFGC. TWR SWITCHED US TO JAX CENTER BUT NO COM WITH JAX. WE THEN TRIED TWR BUT NO COM. THEN WENT BACK TO JAX CENTER. WE TRIED CAPT ON #1 RADIO, FO ON #1 RADIO, CAPT ON #2 RADIO, FO ON #2 RADIO. I DECIDED TO SQUAWK 7600. AS I WAS CHANGING THE SQUAWK TO 7600 I NOTICED THE ACFT CLBING THROUGH 10000 FT WITH VNAV LEVEL ON THE FMA. IT WAS FO'S LEG SO I TOLD HIM TO LEVEL OFF WHICH HE DID. HOWEVER, WE DID GO TO 10500 FT. AT THAT TIME JAX CENTER REACHED US AND CLRED US TO 14000 FT. JAX CENTER ALSO WONDERED IF WE HAD ANOTHER PROBLEM AND I NOTICED 7500 IN THE TRANSPONDER. I TOLD THEM NO WE DID NOT HAVE A PROBLEM. I HAD INADVERTENTLY PUT 7500 INSTEAD OF 7600 IN THE TRANSPONDER OR IT HAD NOT BEEN SET IN THE NOTCH (THE TCASII TRANSPONDERS WILL CHANGE CODES IF NOT SET EXACTLY RIGHT -- ANOTHER LED WONDER). AFTER LNDG IN ATLANTA, MAINT TOLD US THAT A RELAY WAS STICKING IN COM 1 THAT WOULD BLANK OUT RECEPTION IN ALL THE RADIOS. AFTER NOT USING COM 1 FOR AN UNDETERMINED PERIOD OF TIME IT WOULD UNSTICK AND COM COULD BE RESTORED.
Data retrieved from NASA's ASRS site as of July 2007 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.