B767 flight crew experiences a terrain warning at 5000 feet near pumar during flight direct to tegeb...

Narrative:

On ANDES5 arrival; assigned 270 knots and in radar contact with santiago. Cleared direct tegeb (fix on the ILS Y 17L); and cleared to descend to 5000 feet. Dark night; good visibility; numerous ground lights in sight; a dark ridgeline in front and below us; and our ground track going direct was very close to andes 5. In the vicinity of pumar; I leveled at 5000; 250 knots and promptly got a caution terrain followed very shortly by a terrain warning. As pilot flying; I executed an immediate escape maneuver as per QRH. No radio altimeter readings at any time before or during this event. Coordinated a climb to FL120. I made a calming PA and requested vectors back around for another approach. This time santiago kept us at FL075 until the turn just prior to loc intercept approaching tegeb and the approach was normal.although we were in radar contact we should have been more conservative and followed the the company non-radar procedure of staying on course and complying with all step downs; especially the pumar FL070. The 21-1 chart [ILS Y rwy 17L] does not clearly depict terrain in the vicinity of pumar due to a holding pattern inset; although it appears that there is a low area of white on final; in fact the holding inset covers and removes all terrain depictions. The radar mnm altitudes chart is a little difficult to interpret in this same area; again showing all white; although there is a small band where FL075 is the min altitude and I should have noticed that as well. The FL070 at pumar is the biggest clue; although no terrain is clearly depicted at 5000 feet in that area; I now know there is a dark ridgeline there. Although everything was briefed thoroughly; none of us had been there in many years; my copilots were low time pilots new to the company; and I hold myself fully responsible for this event. I will say that even though my mindset was that there was no terrain; my training kicked in and I immediately responded to the warning.

Original NASA ASRS Text

Title: B767 flight crew experiences a terrain warning at 5000 feet near PUMAR during flight direct to TEGEB on the ILS 17R at SCEL. Evasive action is taken and vectors received for a second approach.

Narrative: On ANDES5 arrival; assigned 270 knots and in radar contact with Santiago. Cleared direct TEGEB (fix on the ILS Y 17L); and cleared to descend to 5000 feet. Dark night; good visibility; numerous ground lights in sight; a dark ridgeline in front and below us; and our ground track going direct was very close to Andes 5. In the vicinity of PUMAR; I leveled at 5000; 250 knots and promptly got a caution terrain followed very shortly by a terrain warning. As pilot flying; I executed an immediate escape maneuver as per QRH. No radio altimeter readings at any time before or during this event. Coordinated a climb to FL120. I made a calming PA and requested vectors back around for another approach. This time Santiago kept us at FL075 until the turn just prior to Loc intercept approaching TEGEB and the approach was normal.Although we were in radar contact we should have been more conservative and followed the the company non-radar procedure of staying on course and complying with all step downs; especially the PUMAR FL070. The 21-1 Chart [ILS Y Rwy 17L] does not clearly depict terrain in the vicinity of PUMAR due to a holding pattern inset; although it appears that there is a low area of white on final; in fact the holding inset covers and removes all terrain depictions. The RADAR MNM ALTS chart is a little difficult to interpret in this same area; again showing all white; although there is a small band where FL075 is the min altitude and I should have noticed that as well. The FL070 at PUMAR is the biggest clue; although no terrain is clearly depicted at 5000 feet in that area; I now know there is a dark ridgeline there. Although everything was briefed thoroughly; none of us had been there in many years; my copilots were low time pilots new to the company; and I hold myself fully responsible for this event. I will say that even though my mindset was that there was no terrain; my training kicked in and I immediately responded to the warning.

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	1239820
Time
Date	201502
Local Time Of Day	1801-2400
Place
Locale Reference	SCEL.TRACON
State Reference	FO
Aircraft 1
Make Model Name	B767-300 and 300 ER
Operating Under FAR Part	Part 121
Flight Phase	Descent
Route In Use	STAR ANDES5
Flight Plan	IFR
Component
Aircraft Component	GPWS
Person 1
Function	Captain Pilot Flying
Qualification	Flight Crew Air Transport Pilot (ATP)
Person 2
Function	Pilot Not Flying First Officer
Qualification	Flight Crew Commercial
Events
Anomaly	ATC Issue All Types Aircraft Equipment Problem Less Severe Inflight Event / Encounter CFTT / CFIT

B767 flight crew experiences a terrain warning at 5000 feet near pumar during flight direct to tegeb on the ILS 17R at scel. Evasive action is taken and vectors received for a second approach.