<< >> NASA ASRS Report 294191, January 1995

Flight crew undershot a crossing restr on descent and then overshot altitude resulting in needing to climb back up again.

Attributes
ACN	294191
Time
Date	199501
Day	Thu
Local Time Of Day	1201 To 1800
Place
Locale Reference	atc facility : fwa
State Reference	IN
Altitude	msl bound lower : 14300 msl bound upper : 15000
Environment
Flight Conditions	IMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : slc
Operator	common carrier : air carrier
Make Model Name	Commercial Fixed Wing
Operating Under FAR Part	Part 121
Flight Phase	descent other
Route In Use	enroute airway : zob
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
ASRS Report	294191
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : atp
Experience	flight time last 90 days : 180 flight time total : 6000 flight time type : 180
ASRS Report	294190
Events
Anomaly	altitude deviation : overshoot altitude deviation : crossing restriction not met altitude deviation : undershoot non adherence : clearance
Independent Detector	aircraft equipment other aircraft equipment : unspecified other flight crewa
Resolutory Action	none taken : anomaly accepted
Consequence	Other
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

We were given a crossing restr (25 north of fwa at 15000 ft) and started down in plenty of time at a slow rate of descent intending to increase rate later. Due to choppy air the tail wind was strong and got behind getting indisposed due to icing in the cloud and radio conversation or contacts. We were in a high rate (4000 plus FPM) and missed the crossing restr by 7 mi. The TCASII indicated there were no other aircraft in the area. We also went thru the altitude momentarily and climbed back immediately. This type of situation probably could have been avoided by having just one pilot operate the radios and the other monitor the descent and icing problems specifically. Calling company, at this time, on the other radio should not have been a priority at all.

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Original NASA ASRS Text

Title: FLC UNDERSHOT A XING RESTR ON DSCNT AND THEN OVERSHOT ALT RESULTING IN NEEDING TO CLB BACK UP AGAIN.

Narrative: WE WERE GIVEN A XING RESTR (25 N OF FWA AT 15000 FT) AND STARTED DOWN IN PLENTY OF TIME AT A SLOW RATE OF DSCNT INTENDING TO INCREASE RATE LATER. DUE TO CHOPPY AIR THE TAIL WIND WAS STRONG AND GOT BEHIND GETTING INDISPOSED DUE TO ICING IN THE CLOUD AND RADIO CONVERSATION OR CONTACTS. WE WERE IN A HIGH RATE (4000 PLUS FPM) AND MISSED THE XING RESTR BY 7 MI. THE TCASII INDICATED THERE WERE NO OTHER ACFT IN THE AREA. WE ALSO WENT THRU THE ALT MOMENTARILY AND CLBED BACK IMMEDIATELY. THIS TYPE OF SIT PROBABLY COULD HAVE BEEN AVOIDED BY HAVING JUST ONE PLT OPERATE THE RADIOS AND THE OTHER MONITOR THE DSCNT AND ICING PROBS SPECIFICALLY. CALLING COMPANY, AT THIS TIME, ON THE OTHER RADIO SHOULD NOT HAVE BEEN A PRIORITY AT ALL.

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.