<< >> NASA ASRS Report 487900, October 2000

An air carrier flight crew flying a medium jet transport near cgt reports having to use an excessive rate of descent to meet ATC crossing restr.

Attributes
ACN	487900
Time
Date	200010
Day	Wed
Local Time Of Day	0601 To 1200
Place
Locale Reference	navaid : cgt.vortac
State Reference	IL
Altitude	msl single value : 18000
Environment
Flight Conditions	Mixed
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zau.artcc
Operator	common carrier : air carrier
Make Model Name	Medium Large Transport, Low Wing, 2 Turbojet Eng
Operating Under FAR Part	Part 121
Navigation In Use	other
Flight Phase	descent : intermediate altitude
Route In Use	enroute : direct
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : cfi pilot : atp pilot : flight engineer pilot : instrument pilot : multi engine pilot : commercial
Experience	flight time last 90 days : 200 flight time total : 30000 flight time type : 15000
ASRS Report	487900
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : multi engine pilot : instrument pilot : commercial
Events
Anomaly	altitude deviation : crossing restriction not met other anomaly other
Independent Detector	other flight crewa other flight crewb
Resolutory Action	controller : issued new clearance controller : provided flight assist none taken : anomaly accepted
Supplementary
Problem Areas	Flight Crew Human Performance
Primary Problem	Ambiguous

Narrative:

After receiving a clearance to cross 40 mi south of cgt at 12000 ft, we entered an area of virga and began to encounter light to moderate turbulence. We proceeded to secure the passenger cabin and warn the flight attendants by having them take their seats. As we finished that, our FMC told us we were 4000 ft high on the descent profile. We deployed speed brakes, initiated maximum rate of descent and advised ZAU we would be high. ATC advised only to give a good rate down to 10000 ft. We were able to cross our fix at 11000 ft. Rest of flight normal. No conflicts or traffic at our descent fix.

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Original NASA ASRS Text

Title: AN ACR FLC FLYING A MEDIUM JET TRANSPORT NEAR CGT RPTS HAVING TO USE AN EXCESSIVE RATE OF DSCNT TO MEET ATC XING RESTR.

Narrative: AFTER RECEIVING A CLRNC TO CROSS 40 MI S OF CGT AT 12000 FT, WE ENTERED AN AREA OF VIRGA AND BEGAN TO ENCOUNTER LIGHT TO MODERATE TURB. WE PROCEEDED TO SECURE THE PAX CABIN AND WARN THE FLT ATTENDANTS BY HAVING THEM TAKE THEIR SEATS. AS WE FINISHED THAT, OUR FMC TOLD US WE WERE 4000 FT HIGH ON THE DSCNT PROFILE. WE DEPLOYED SPD BRAKES, INITIATED MAX RATE OF DSCNT AND ADVISED ZAU WE WOULD BE HIGH. ATC ADVISED ONLY TO GIVE A GOOD RATE DOWN TO 10000 FT. WE WERE ABLE TO CROSS OUR FIX AT 11000 FT. REST OF FLT NORMAL. NO CONFLICTS OR TFC AT OUR DSCNT FIX.

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.