B767 relief pilot reported being dispatched as part of a four man crew in an aircraft with only one ...

Narrative:

Four person crew [was] sent out on what is a typically 3 person trip. Aircraft crew rest facility is typically a first class seat with a surrounding curtain. As we had 4 pilots; we took two breaks; with two pilots breaking each period. Problem is; the aircraft only has one first class seat with a curtain - meaning only one pilot per break would get meaningful rest - the other pilot must try and rest/sleep in a seat that is in the middle of a daylight cabin with no curtain. This essentially means we know before we leave; that we'll be arriving in europe with half of our pilots with no meaningful rest. This is an unsafe practice; and should stop. Anyhow; as I am a relief pilot and must take first break; (and was unlucky enough to not get the seat with the curtain) I did not get any rest during my break period. This is because my break was during daylight hours in the middle of a cabin that had a meal service. Later; when I was on the flight deck as the pilot flying (and around 2 am body clock time) I fell asleep as I was exhausted. Go figure - who would have guessed I would be tired at 2 am with no rest? Must just be me.

Original NASA ASRS Text

Title: B767 Relief Pilot reported being dispatched as part of a four man crew in an aircraft with only one curtained crew rest seat. With no rest obtained during his break he is overcome with fatigue and falls asleep while on duty in the cockpit.

Narrative: Four person crew [was] sent out on what is a typically 3 person trip. Aircraft crew rest facility is typically a First Class seat with a surrounding curtain. As we had 4 pilots; we took two breaks; with two pilots breaking each period. Problem is; the aircraft only has one First Class seat with a curtain - meaning only one pilot per break would get meaningful rest - the other pilot must try and rest/sleep in a seat that is in the middle of a daylight cabin with no curtain. This essentially means we know before we leave; that we'll be arriving in Europe with half of our pilots with no meaningful rest. This is an unsafe practice; and should stop. Anyhow; as I am a Relief Pilot and must take first break; (and was unlucky enough to not get the seat with the curtain) I did not get any rest during my break period. This is because my break was during daylight hours in the middle of a cabin that had a meal service. Later; when I was on the flight deck as the pilot flying (and around 2 am body clock time) I fell asleep as I was exhausted. Go figure - who would have guessed I would be tired at 2 am with no rest? Must just be me.

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	1192570
Time
Date	201407
Place
Locale Reference	ZZZZ.ARTCC
State Reference	FO
Environment
Flight Conditions	VMC
Aircraft 1
Make Model Name	B767 Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Flight Phase	Cruise
Route In Use	Oceanic
Person 1
Function	Relief Pilot Pilot Flying
Events
Anomaly	Aircraft Equipment Problem Less Severe Deviation - Procedural Other / Unknown

B767 relief pilot reported being dispatched as part of a four man crew in an aircraft with only one curtained crew rest seat. With no rest obtained during his break he is overcome with fatigue and falls asleep while on duty in the cockpit.