Crossing restr a jokur intersection not met due to planning, wind factors, distraction and unfamilia...

Attributes
ACN	525270
Time
Date	200109
Day	Tue
Local Time Of Day	1801 To 2400
Place
Locale Reference	intersection : jokur
State Reference	CA
Altitude	msl bound lower : 24000 msl bound upper : 24600
Environment
Flight Conditions	VMC
Light	Dusk
Aircraft 1
Controlling Facilities	tower : ewr.tower
Operator	common carrier : air carrier
Make Model Name	B737-300
Flight Phase	cruise : enroute altitude change descent : intermediate altitude
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Experience	flight time last 90 days : 240 flight time total : 4000 flight time type : 1000
ASRS Report	525270
Events
Anomaly	altitude deviation : crossing restriction not met non adherence : clearance other anomaly
Resolutory Action	none taken : insufficient time
Supplementary
Problem Areas	Flight Crew Human Performance
Primary Problem	Flight Crew Human Performance

Narrative:

Told by ZLA to maintain best forward speed. Later given clearance to cross jokur at FL240. FMC properly programmed and I began a planned mach .76/320 FPM descent about 5 mi before FMC directed top of descent. During descent I gave the destination WX PA and also had a flight attendant enter cockpit. I then noticed I was high on profile primarily because I was slow at about 280 KTS. I then lowered the nose to accelerate and increase rate of descent. I thought I was going to make the restr, but the autoplt captured the altitude about 2000 ft high due to a high rate of descent and as the autoplt shallowed out the descent we were at 600 ft high at jokur. The captain also said we had an increasing tailwind as we descended, which added to the problem. I did not pay enough attention to the progress of my descent because I started down early and assumed there wouldn't be any problems. I diverted my attention accomplishing some other tasks and a lack of understanding how the autoplt captures altitudes also contributed.

Original NASA ASRS Text

Title: XING RESTR A JOKUR INTXN NOT MET DUE TO PLANNING, WIND FACTORS, DISTR AND UNFAMILIARITY WITH AUTOFLT SYS LEVELOFF CHARACTERISTICS.

Narrative: TOLD BY ZLA TO MAINTAIN BEST FORWARD SPD. LATER GIVEN CLRNC TO CROSS JOKUR AT FL240. FMC PROPERLY PROGRAMMED AND I BEGAN A PLANNED MACH .76/320 FPM DSCNT ABOUT 5 MI BEFORE FMC DIRECTED TOP OF DSCNT. DURING DSCNT I GAVE THE DEST WX PA AND ALSO HAD A FLT ATTENDANT ENTER COCKPIT. I THEN NOTICED I WAS HIGH ON PROFILE PRIMARILY BECAUSE I WAS SLOW AT ABOUT 280 KTS. I THEN LOWERED THE NOSE TO ACCELERATE AND INCREASE RATE OF DSCNT. I THOUGHT I WAS GOING TO MAKE THE RESTR, BUT THE AUTOPLT CAPTURED THE ALT ABOUT 2000 FT HIGH DUE TO A HIGH RATE OF DSCNT AND AS THE AUTOPLT SHALLOWED OUT THE DSCNT WE WERE AT 600 FT HIGH AT JOKUR. THE CAPT ALSO SAID WE HAD AN INCREASING TAILWIND AS WE DSNDED, WHICH ADDED TO THE PROB. I DID NOT PAY ENOUGH ATTN TO THE PROGRESS OF MY DSCNT BECAUSE I STARTED DOWN EARLY AND ASSUMED THERE WOULDN'T BE ANY PROBS. I DIVERTED MY ATTN ACCOMPLISHING SOME OTHER TASKS AND A LACK OF UNDERSTANDING HOW THE AUTOPLT CAPTURES ALTS ALSO CONTRIBUTED.

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.

Crossing restr a jokur intersection not met due to planning, wind factors, distraction and unfamiliarity with autoflt system leveloff characteristics.