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ZOB controller described incident when aircraft emergency descent resulted in less than standard separation at 13500 ft.
| Attributes | |
| ACN | 719903 |
| Time | |
| Date | 200612 |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | atc facility : zzz.artcc |
| State Reference | US |
| Altitude | msl single value : 13500 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zzz.artcc |
| Operator | common carrier : air carrier |
| Make Model Name | EMB ERJ 145 ER&LR |
| Operating Under FAR Part | Part 121 |
| Flight Phase | descent : approach |
| Flight Plan | IFR |
| Aircraft 2 | |
| Controlling Facilities | artcc : zzz.artcc |
| Operator | common carrier : air carrier |
| Make Model Name | DC-9 Undifferentiated or Other Model |
| Operating Under FAR Part | Part 121 |
| Flight Phase | climbout : initial |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | government : faa |
| Function | controller : radar |
| Qualification | controller : radar |
| Experience | controller radar : 7 |
| ASRS Report | 719903 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Events | |
| Anomaly | aircraft equipment problem : critical conflict : airborne less severe non adherence : required legal separation |
| Independent Detector | other controllera |
| Resolutory Action | flight crew : declared emergency flight crew : took evasive action |
| Miss Distance | horizontal : 23400 vertical : 100 |
| Supplementary | |
| Problem Areas | Aircraft |
| Primary Problem | Aircraft |
Narrative:
I was working YYY sector without a d-side when ZZZ sector called me with air carrier X an E145/left experiencing pressurization problems. He was at FL240 and needed lower. I approved FL220. Before I was in communication with air carrier X; ZZZ radar controller called and said air carrier X would need lower. I coordinated with XXX and WWW sectors for air carrier X descending to 170. When I talked to air carrier X I cleared him to 170 for traffic; he advised that he would have to declare an emergency if I was unable lower than 170. At that point I declared him an emergency; reissued 170 and told him to advise what altitude he would be descending to. I then asked for a d-side and immediately received one; and I advised my supervisor of the emergency. I then coordinated control for turns with WWW sector of air carrier Y who was traffic for the emergency and advised WWW sector that air carrier X was an emergency and would be descending to 100. I called traffic to air carrier X for the 160 traffic and also air carrier Z a departure climbing to 130 being worked by WWW. Air carrier X descended to 090 and was switched to approach after he cleared traffic. After receiving control for turns of air carrier Y from WWW sector I turned air carrier Y to a 270 degree heading and also a 250 degree heading to keep him clear of air carrier X.
Original NASA ASRS Text
Title: ZOB CTLR DESCRIBED INCIDENT WHEN ACFT EMER DSCNT RESULTED IN LTSS AT 13500 FT.
Narrative: I WAS WORKING YYY SECTOR WITHOUT A D-SIDE WHEN ZZZ SECTOR CALLED ME WITH ACR X AN E145/L EXPERIENCING PRESSURIZATION PROBS. HE WAS AT FL240 AND NEEDED LOWER. I APPROVED FL220. BEFORE I WAS IN COM WITH ACR X; ZZZ RADAR CTLR CALLED AND SAID ACR X WOULD NEED LOWER. I COORDINATED WITH XXX AND WWW SECTORS FOR ACR X DSNDING TO 170. WHEN I TALKED TO ACR X I CLRED HIM TO 170 FOR TFC; HE ADVISED THAT HE WOULD HAVE TO DECLARE AN EMER IF I WAS UNABLE LOWER THAN 170. AT THAT POINT I DECLARED HIM AN EMER; REISSUED 170 AND TOLD HIM TO ADVISE WHAT ALT HE WOULD BE DSNDING TO. I THEN ASKED FOR A D-SIDE AND IMMEDIATELY RECEIVED ONE; AND I ADVISED MY SUPVR OF THE EMER. I THEN COORDINATED CTL FOR TURNS WITH WWW SECTOR OF ACR Y WHO WAS TFC FOR THE EMER AND ADVISED WWW SECTOR THAT ACR X WAS AN EMER AND WOULD BE DSNDING TO 100. I CALLED TFC TO ACR X FOR THE 160 TFC AND ALSO ACR Z A DEP CLBING TO 130 BEING WORKED BY WWW. ACR X DSNDED TO 090 AND WAS SWITCHED TO APCH AFTER HE CLRED TFC. AFTER RECEIVING CTL FOR TURNS OF ACR Y FROM WWW SECTOR I TURNED ACR Y TO A 270 DEG HDG AND ALSO A 250 DEG HDG TO KEEP HIM CLR OF ACR X.
Data retrieved from NASA's ASRS site as of January 2009 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.