Date: 202011
Local time of day: 0601-1200
Location: ORD.Airport, IL
Aircraft: Commercial Fixed Wing
Operator: Air Carrier
Operating under: Part 121
Flight plan: IFR
Mission: Passenger
Flight phase: Initial Approach
Airspace: Class B ORD
ATC / advisory: TRACON C90
Reporter organization: Air Carrier
Reporter function: Pilot Not Flying; First Officer
Reporter qualification: Flight Crew Air Transport Pilot (ATP); Flight Crew Instrument; Flight Crew Multiengine
Human factors: Fatigue; Distraction
Second reporter function: Captain; Pilot Flying
Anomaly: Conflict Airborne Conflict; Deviation - Track / Heading All Types; Deviation / Discrepancy - Procedural Clearance; Inflight Event / Encounter Other / Unknown
Detector: Person Air Traffic Control; Person Flight Crew
When detected: In-flight
Result: Air Traffic Control Provided Assistance; Flight Crew Overcame Equipment Problem; Flight Crew Became Reoriented; Flight Crew Returned To Clearance
Contributing factors: Human Factors
Primary problem: Human Factors

Narrative: Approach gave us a heading to intercept the 28C localizer.  Captain turned to that heading but didn't not select a different NAV mode.  I assumed he was waiting for wings level to select NAV.  At wings level; he did nothing so I asked if we were cleared for the approach.  He thanked me and selected NAV.  At that point I believe we were too far to intercept the course.  Approach asked if we were going through course.  They gave us a heading to the south to reintercept.  Captain left autopilot on and the aircraft was slow turning and I didn't take the plane and turn the autopilot off.  Approach called traffic 1;000 ft above on the 27L approach.  We had the traffic and were given an additional turn south; and decent to 4;000 ft and recleared for the Visual for 28C. [Reporter stated a contributing] cause was end of a 4 day trip and we were tired.  Also; we had more discussion in sterile [cockpit] than normal as an aircraft ahead of us had reported a drone approximately 400 ft below them on final.  I was uncertain which aircraft this was relative to our position on the approach; so we were discussing that. [Reporter resolves to] pay closer attention.  Disengage autopilot to correct more quickly.


Second narrative: I was pilot flying.  We were vectored to the ILS for runway 28C in ORD. We were instructed to join localizer for 28C. I was planning to use LNAV  and VNAV until outside the final approach fix. As we turned to vector to join; I paused before hitting LNAV because usually the aircraft would turn towards course immediately and if you wait it will fly the heading and then join. Approach had us a little too close for that and with 15 knots of wind from south we flew through the course. The FO pointed that out and I turned at same time as approach gave us another heading to join. We were also given a lower altitude. Auto pilot was on. We then joined the localizer and continued the approach. We were vectored close in and with the 15 knot cross wind; pushed through localizer. I needed to do better monitoring of where the course was.


Synopsis: Air carrier First Officer reported approach clearance deviation resulting in ATC assigned vectors to restart the approach for an uneventful landing.