<< >> NASA ASRS Report 1384564, August 2016

A departing A321 flight crew reported having to climb at a slow speed to comply with RNAV SID altitude restrictions. An in trail departing aircraft overtook the A321 casing a loss of required separation.

Attributes
ACN	1384564
Time
Date	201608
Local Time Of Day	0601-1200
Place
Locale Reference	DFW.Airport
State Reference	TX
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Make Model Name	A321
Operating Under FAR Part	Part 121
Flight Phase	Climb
Route In Use	SID ZACHH2
Flight Plan	IFR
Person 1
Function	Captain Pilot Not Flying
Qualification	Flight Crew Air Transport Pilot (ATP)
Person 2
Function	Pilot Flying First Officer
Qualification	Flight Crew Air Transport Pilot (ATP)
Events
Anomaly	ATC Issue All Types Conflict Airborne Conflict

Narrative:

Departed on the zachh 2 departure. Flew in a slow climb to make both the cuzen restriction (max speed 240/+5;000) and feztr at or above 7;000 feet. ATC said our slow speed caused a traffic conflict. ATC gave us a number to call.heavy A321 has a tough time making dfw departure restrictions. Cannot make these restrictions with normal procedures! Get rid of hard altitudes on departures.

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Original NASA ASRS Text

Title: A departing A321 flight crew reported having to climb at a slow speed to comply with RNAV SID altitude restrictions. An in trail departing aircraft overtook the A321 casing a loss of required separation.

Narrative: Departed on the ZACHH 2 Departure. Flew in a slow climb to make both the CUZEN restriction (max speed 240/+5;000) and FEZTR at or above 7;000 feet. ATC said our slow speed caused a traffic conflict. ATC gave us a number to call.Heavy A321 has a tough time making DFW departure restrictions. Cannot make these restrictions with normal procedures! Get rid of hard altitudes on departures.

Data retrieved from NASA's ASRS site 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.