A11 controller reports of a low altitude alert caused by an aircraft not turning as instructed. Airc...

Narrative:

Aircraft X departed runway 7L on the anchorage six SID. The SID states to fly runway heading until 2;000 or ted VOR 4 DME; whichever comes first; then turn right to heading 200. Aircraft X was observed to reach 2;000 about 3.5 miles from the VOR. A low altitude alert alarmed and aircraft X was issued a low altitude alert. We verified aircraft X was in the turn to heading 200. The aircraft responded in the affirmative. Aircraft X was observed to pass an estimated 2.8 miles from a mountain at 4;000 where the mountain peak is depicted on our charts as 4;700. This event is not a singular occurrence. The altitude and DME for this procedure is the same as the KNIK9 SID. One SID has the '2;000 or 4 DME - whichever comes first' in the narrative of the SID and the other has it in the depiction. I believe this causes confusion to pilots as numerous heavy aircraft wait until 4 DME prior to turning; regardless of altitude. I recommend the charts be changed to both show '4 DME or 2;000 ft - whichever comes first' in both the narrative and depiction. I also recommend heavy aircraft not be issued the anchorage six departure due to unsafe proximity to terrain.

Original NASA ASRS Text

Title: A11 Controller reports of a low altitude alert caused by an aircraft not turning as instructed. Aircraft turned and left low altitude area. Controller reports this is not uncommon for this type of aircraft and recommends this type of aircraft not to be allowed to fly this departure.

Narrative: Aircraft X departed Runway 7L on the ANCHORAGE SIX SID. The SID states to fly runway heading until 2;000 or TED VOR 4 DME; whichever comes first; then turn right to heading 200. Aircraft X was observed to reach 2;000 about 3.5 miles from the VOR. A low altitude alert alarmed and Aircraft X was issued a low altitude alert. We verified Aircraft X was in the turn to heading 200. The aircraft responded in the affirmative. Aircraft X was observed to pass an estimated 2.8 miles from a mountain at 4;000 where the mountain peak is depicted on our charts as 4;700. This event is not a singular occurrence. The altitude and DME for this procedure is the same as the KNIK9 SID. One SID has the '2;000 or 4 DME - Whichever Comes First' in the narrative of the SID and the other has it in the depiction. I believe this causes confusion to pilots as numerous heavy aircraft wait until 4 DME prior to turning; regardless of altitude. I recommend the charts be changed to both show '4 DME or 2;000 FT - Whichever Comes First' in both the narrative and depiction. I also recommend heavy aircraft not be issued the ANCHORAGE SIX Departure due to unsafe proximity to terrain.

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.

Attributes
ACN	1258429
Time
Date	201504
Local Time Of Day	1801-2400
Place
Locale Reference	ANC.Airport
State Reference	AK
Environment
Light	Night
Aircraft 1
Make Model Name	Widebody Low Wing 4 Turbojet Eng
Operating Under FAR Part	Part 129
Flight Phase	Initial Climb
Route In Use	SID ANCHORAGE SIX
Flight Plan	IFR
Person 1
Function	Departure
Qualification	Air Traffic Control Fully Certified
Experience	Air Traffic Control Time Certified In Pos 1 (yrs) 2
Events
Anomaly	Deviation - Procedural Published Material / Policy Inflight Event / Encounter CFTT / CFIT

A11 controller reports of a low altitude alert caused by an aircraft not turning as instructed. Aircraft turned and left low altitude area. Controller reports this is not uncommon for this type of aircraft and recommends this type of aircraft not to be allowed to fly this departure.