B767-300 first officer; the pilot monitoring; reported a track deviation when the pilot flying faile...

Narrative:

[ATC] had given us a clearance to fly 6 miles right of track. As pilot monitoring (pm); I read back the clearance and entered the offset into the FMC. The captain; pilot flying (PF) selected heading sel and turned toward the offset route. He had been done this on each of his legs before (and I sometimes do the same) so I saw nothing amiss. The captain had his hands on the yoke so I went back to my ipad that I had open to study since I had recurrent training soon. I was not monitoring the intercept. I did not notice that the captain never selected LNAV. In the dark cockpit I did not notice the captains head droop slightly. When [ATC] queried us as to our course/offset; I noticed the captain's head come up and saw that we were well past our six mile offset. I pulled up the progress page and saw that we were nine miles farther right than cleared. The captain had already begun a change of course back to our cleared offset. The controllers only comment was that we were headed out of his sector. I lost sight of my duties as pm when the captain kept his hands on the yoke for the intercept. While on autopilot; I had not witnessed him keeping his hands on the yoke before. I also did not notice that he nodded off during the minute it took to offset those six miles. It took a matter of reading one page to miss the actions that should have been occurring. In light of this error; I will have to be cognizant of where my attention is drawn. There is no reason to pay attention to other; non-flight things when a change is occurring over such a short time span. Also; pm duties include everything associated with the flight; the other pilot included.

Original NASA ASRS Text

Title: B767-300 First Officer; the pilot monitoring; reported a track deviation when the pilot flying failed to select LNAV during an offset maneuver. Fatigue was cited as a contributing factor.

Narrative: [ATC] had given us a clearance to fly 6 miles right of track. As Pilot Monitoring (PM); I read back the clearance and entered the offset into the FMC. The Captain; Pilot Flying (PF) selected HDG SEL and turned toward the offset route. He had been done this on each of his legs before (and I sometimes do the same) so I saw nothing amiss. The Captain had his hands on the yoke so I went back to my iPad that I had open to study since I had recurrent training soon. I was not monitoring the intercept. I did not notice that the Captain never selected LNAV. In the dark cockpit I did not notice the Captains head droop slightly. When [ATC] queried us as to our course/offset; I noticed the Captain's head come up and saw that we were well past our six mile offset. I pulled up the PROGRESS page and saw that we were nine miles farther right than cleared. The Captain had already begun a change of course back to our cleared offset. The Controllers only comment was that we were headed out of his sector. I lost sight of my duties as PM when the Captain kept his hands on the yoke for the intercept. While on autopilot; I had not witnessed him keeping his hands on the yoke before. I also did not notice that he nodded off during the minute it took to offset those six miles. It took a matter of reading one page to miss the actions that should have been occurring. In light of this error; I will have to be cognizant of where my attention is drawn. There is no reason to pay attention to other; non-flight things when a change is occurring over such a short time span. Also; PM duties include everything associated with the flight; the other pilot included.

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	1274419
Time
Date	201506
Local Time Of Day	0001-0600
Place
Locale Reference	ZZZZ.ARTCC
State Reference	FO
Environment
Flight Conditions	VMC
Light	Night
Aircraft 1
Make Model Name	B767-300 and 300 ER
Operating Under FAR Part	Part 121
Flight Phase	Cruise
Flight Plan	IFR
Person 1
Function	First Officer Pilot Not Flying
Events
Anomaly	Deviation - Procedural Clearance Deviation - Procedural Published Material / Policy Deviation - Track / Heading All Types

B767-300 first officer; the pilot monitoring; reported a track deviation when the pilot flying failed to select LNAV during an offset maneuver. Fatigue was cited as a contributing factor.