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B767 first officer reported a track deviation occurred on the RNAV (rnp) 26R arrival to iah even though the FMC seemed to be programmed properly.
| Attributes | |
| ACN | 1564606 |
| Time | |
| Date | 201807 |
| Local Time Of Day | 1201-1800 |
| Place | |
| Locale Reference | IAH.Airport |
| State Reference | TX |
| Environment | |
| Flight Conditions | VMC |
| Aircraft 1 | |
| Make Model Name | B767 Undifferentiated or Other Model |
| Operating Under FAR Part | Part 121 |
| Flight Phase | Final Approach |
| Flight Plan | IFR |
| Person 1 | |
| Function | First Officer Pilot Not Flying |
| Qualification | Flight Crew Air Transport Pilot (ATP) Flight Crew Instrument Flight Crew Multiengine |
| Experience | Flight Crew Last 90 Days 180 Flight Crew Total 3468.13 Flight Crew Type 2544.38 |
| Events | |
| Anomaly | Aircraft Equipment Problem Less Severe Deviation - Procedural Clearance Deviation - Procedural Published Material / Policy Deviation - Track / Heading All Types |
Narrative:
Approaching iah ATIS advertised possibility of receiving RNAV (rnp) 26R. Captain did a thorough STAR and approach briefing using the 767 qrg RNAV (rnp) approach briefing guide. ATC cleared; and crew loaded; verified; and executed DRILLR5 STAR connecting to line selectable RNAV (rnp) 26R. There was no discontinuity on legs page of FMC. It read: skler-drkar-vectors-soopr-owell... To the runway. HSI magenta line showed a line continuing straight ahead from drkar as well as a curved RF path between drkar and soopr. Left autopilot was on and connected; and [mnemonic] procedure completed with tdze altitude set in MCP. During the arrival briefing; I brought up that 'vectors' was in the legs page between drkar and soopr. However; plan and map mode showed the RF as stated above; with a curved RF path connecting drkar and soopr. After complete discussion among the flight deck crew; and referencing the QRH briefing guide (specifically under FMC setup/legs 'do not add or delete waypoints between the FAF/fap/gp intercept and the runway/map inclusive') the entire crew expected the aircraft to follow the leg to soopr. Instead; after passing drkar the aircraft continued on 087 degrees heading/vector. Within 10 seconds; and before captain could react; ATC advised that we were late to make the turn; and needed to discontinue the RNAV (rnp) 26R. ATC changed approach to vectors ILS 26R. Subsequent approach and landing were normal.
Original NASA ASRS Text
Title: B767 First Officer reported a track deviation occurred on the RNAV (RNP) 26R arrival to IAH even though the FMC seemed to be programmed properly.
Narrative: Approaching IAH ATIS advertised possibility of receiving RNAV (RNP) 26R. Captain did a thorough STAR and approach briefing using the 767 QRG RNAV (RNP) Approach Briefing Guide. ATC cleared; and crew loaded; verified; and executed DRILLR5 STAR connecting to line selectable RNAV (RNP) 26R. There was no discontinuity on LEGS page of FMC. It read: SKLER-DRKAR-VECTORS-SOOPR-OWELL... to the runway. HSI magenta line showed a line continuing straight ahead from DRKAR as well as a curved RF path between DRKAR and SOOPR. Left autopilot was on and connected; and [mnemonic] procedure completed with TDZE altitude set in MCP. During the arrival briefing; I brought up that 'VECTORS' was in the LEGS page between DRKAR and SOOPR. However; PLAN and MAP mode showed the RF as stated above; with a curved RF path connecting DRKAR and SOOPR. After complete discussion among the flight deck crew; and referencing the QRH Briefing Guide (specifically under FMC Setup/LEGS 'Do not add or delete waypoints between the FAF/FAP/GP Intercept and the RWY/MAP inclusive') the entire crew expected the aircraft to follow the leg to SOOPR. Instead; after passing DRKAR the aircraft continued on 087 degrees heading/vector. Within 10 seconds; and before Captain could react; ATC advised that we were late to make the turn; and needed to discontinue the RNAV (RNP) 26R. ATC changed approach to vectors ILS 26R. Subsequent approach and landing were normal.
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.