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Hawker captain reported no compass guidance after takeoff due to the accidental selection of the IRS as source.
| Attributes | |
| ACN | 1512151 |
| Time | |
| Date | 201801 |
| Local Time Of Day | 1201-1800 |
| Place | |
| Locale Reference | BNA.Airport |
| State Reference | TN |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Make Model Name | HS 125 Series |
| Operating Under FAR Part | Part 135 |
| Flight Phase | Initial Climb |
| Route In Use | SID DRURY3 |
| Flight Plan | IFR |
| Component | |
| Aircraft Component | Navigational Equipment and Processing |
| Person 1 | |
| Function | Captain |
| Qualification | Flight Crew Air Transport Pilot (ATP) |
| Experience | Flight Crew Last 90 Days 95 Flight Crew Total 16500 Flight Crew Type 2400 |
| Events | |
| Anomaly | Aircraft Equipment Problem Less Severe Deviation - Procedural Published Material / Policy Deviation - Track / Heading All Types Flight Deck / Cabin / Aircraft Event Other / Unknown |
Narrative:
Upon entering the runway for takeoff; the crew confirmed compass heading position and captain re-adjusted rudder pedals in order to have full comfortable control of steering being the runway was contaminated. Upon doing so; unknowingly and accidentally a switch was moved (probably by the knee) that placed the gyros to an inertial reference system (IRS) feed however the IRS was not turned on (IRS used only for long overwater navigation and was not required). The actual light for the IRS did not turn on so captain did not notice the compass feed was changed. Upon departure; we were confronted with no directional heading on the HSI compass of either side. After trying to determine why the problem we eventually noticed the IRS to have been selected for heading by basically switching switches to try to determine why we were having this problem. The light bulb was bad and was replaced at destination. ATC was very helpful in giving us time to fix our issue. We did not come close to any other aircraft in the process of this situation nor did we lose control of the aircraft. At all times; we had magnetic compass but initially we were a bit confused as to our position due to the wrong information we were looking at on the HSI.
Original NASA ASRS Text
Title: Hawker Captain reported no compass guidance after takeoff due to the accidental selection of the IRS as source.
Narrative: Upon entering the runway for takeoff; the crew confirmed compass heading position and captain re-adjusted rudder pedals in order to have full comfortable control of steering being the runway was contaminated. Upon doing so; unknowingly and accidentally a switch was moved (probably by the knee) that placed the gyros to an Inertial Reference System (IRS) feed however the IRS was not turned on (IRS used only for long overwater navigation and was not required). The actual light for the IRS did not turn on so captain did not notice the compass feed was changed. Upon departure; we were confronted with no directional heading on the HSI compass of either side. After trying to determine why the problem we eventually noticed the IRS to have been selected for heading by basically switching switches to try to determine why we were having this problem. The light bulb was bad and was replaced at destination. ATC was very helpful in giving us time to fix our issue. We did not come close to any other aircraft in the process of this situation nor did we lose control of the aircraft. At all times; we had magnetic compass but initially we were a bit confused as to our position due to the wrong information we were looking at on the HSI.
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.