Air carrier in a high rate of descent is issued another altitude assignment and goes through the new...

Attributes
ACN	256870
Time
Date	199311
Day	Tue
Local Time Of Day	1201 To 1800
Place
Locale Reference	atc facility : atl
State Reference	GA
Altitude	msl bound lower : 12700 msl bound upper : 13000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tower : dfw
Operator	common carrier : air carrier
Make Model Name	Medium Large Transport, Low Wing, 2 Turbojet Eng
Flight Phase	descent other
Route In Use	arrival other enroute airway : ztl
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : atp pilot : flight engineer
Experience	flight time last 90 days : 153 flight time total : 5326 flight time type : 3100
ASRS Report	256870
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 140 flight time total : 12800 flight time type : 4700
ASRS Report	256868
Events
Anomaly	altitude deviation : overshoot other anomaly other
Independent Detector	other flight crewa
Resolutory Action	none taken : unable
Consequence	Other
Supplementary
Primary Problem	Aircraft
Air Traffic Incident	other

Narrative:

We left holding at lgc VOR at 16000 ft with ZTL. On leaving holding we were switched to a different frequency (120.45). Another aircraft on this frequency had an intermittent stuck microphone. ZTL gave us airspeed 250 KTS and to expect honie (atl 228/40) at 12000 ft. At 48 DME from atl we had heard nothing from ZTL. We were looking for another frequency when the microphone unstuck. ZTL told us to descend immediately to 12000 ft then slow to 250 KTS. As we descended through 14000 ft at greater than 4000 FPM descent rate and increasing speed, she said approach control could not take us and maintain 13000 ft, slow to 250 KTS, and turn to a heading of 180 degrees. We pulled out of the steep dive at 12700 ft and climbed back to 13000 ft. All this occurred within a time span of less than a min.

Original NASA ASRS Text

Title: ACR IN A HIGH RATE OF DSCNT IS ISSUED ANOTHER ALT ASSIGNMENT AND GOES THROUGH THE NEW ALT.

Narrative: WE LEFT HOLDING AT LGC VOR AT 16000 FT WITH ZTL. ON LEAVING HOLDING WE WERE SWITCHED TO A DIFFERENT FREQ (120.45). ANOTHER ACFT ON THIS FREQ HAD AN INTERMITTENT STUCK MIKE. ZTL GAVE US AIRSPD 250 KTS AND TO EXPECT HONIE (ATL 228/40) AT 12000 FT. AT 48 DME FROM ATL WE HAD HEARD NOTHING FROM ZTL. WE WERE LOOKING FOR ANOTHER FREQ WHEN THE MIKE UNSTUCK. ZTL TOLD US TO DSND IMMEDIATELY TO 12000 FT THEN SLOW TO 250 KTS. AS WE DSNDED THROUGH 14000 FT AT GREATER THAN 4000 FPM DSCNT RATE AND INCREASING SPD, SHE SAID APCH CTL COULD NOT TAKE US AND MAINTAIN 13000 FT, SLOW TO 250 KTS, AND TURN TO A HDG OF 180 DEGS. WE PULLED OUT OF THE STEEP DIVE AT 12700 FT AND CLBED BACK TO 13000 FT. ALL THIS OCCURRED WITHIN A TIME SPAN OF LESS THAN A MIN.

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.

Air carrier in a high rate of descent is issued another altitude assignment and goes through the new altitude.