China Airlines B744 at Chicago on Jun 21st 2018, veered off the runway and went around

Last Update: May 21, 2022 / 18:19:01 GMT/Zulu time

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Incident Facts

Date of incident
Jun 21, 2018


Aircraft Registration

Aircraft Type
Boeing 747-400

ICAO Type Designator

Airport ICAO Code

A China Airlines Boeing 747-400 freighter, registration B-18711 performing freight flight CI-5148 from Anchorage,AK to Chicago O'Hare,IL (USA) with 4 crew, was on an ILS approach to runway 10L at 09:57L (14:57Z) when the crew advised they were going around having had a last minute deviation on the runway. The crew of another aircraft on the ground advised the aircraft had gone off the runway, a third crew advised tower the runway needed to be inspected. A runway inspection found debris on the runway, the windsock (WDI) to the left (north) of the runway between taxiway DD and N1 was found damaged, the runway was closed for about 50 minutes. In the meantime B-18711 positioned for another approach and landed safely on runway 09R about 25 minutes after the go around.

The FAA reported the flight touched down in the grass, went around and returned to land. None of the 4 occupants was injured, the aircraft sustained minor damage.

On Jul 25th 2018 the NTSB reported the Boeing 747-400 "experienced a runway excursion off the left side of runway 10L shortly after touchdown and subsequently conducted a go around". None of the 4 crew were injured, the aircraft was not damaged. The occurrence was rated an incident and is being investigated.

The occurrence aircraft remained on the ground in Chicago until Jul 4th 2018 (for 13 days) before returning to service.

On May 21st 2022 the NTSB released their final report concluding the probable causes of the incident were:

Interference with the localizer signal resulting in a Multipath condition experienced by CAL5148 while conducting an ILS CAT III (autoland) approach. This condition resulted in a runway excursion and subsequent go-around. The interference was most likely caused by a previous departure flying through the ILS critical area while departing the same runway.

The NTSB analysed:

CAL5148 was conducting an ILS autoland approach to runway 10R. Instrument meteorological conditions prevailed at the time of the incident, with an overcast ceiling of 600 feet above ground level (agl), and visibility of 2 and 1/2 miles with moderate rain. These conditions required protection of the ILS critical area by ATC which they did according to FAA Order JO 7110.65, Air Traffic Control. ATC issues control instructions to protect ILS critical areas and avoid signal interference from vehicle traffic and taxiing aircraft when the reported weather is a ceiling of less than 800 feet or visibility of less than 2 miles. However, this restriction does not include consideration for preceding arriving or departing aircraft.

While a previously departed aircraft was airborne and over the ILS critical area, CAL5148 experienced localizer deviations while on short final. In math modelling analysis of this event conducted by the FAA; the results were consistent with the localizer deviations determined from CAL5148 flight data recorder (FDR) data. Specifically, the modelling indicated the deviation beginning at 1/4 mile from threshold would lead the aircraft to turn left to continue to follow the localizer course line during an autoland approach. The FAA National Resource Engineer for Navigation who performed the modelling wrote “I am 90% confident that the location of departing ENY3544 caused sufficient Multipath (signal deflection) to produce a fly left indication to arriving CAL5148.”

“Multipath” is a term used to describe the distortion of the radiated signal which is caused by the signal being deflected off either stationary or moving objects such as aircraft or vehicles in the localizer or glide slope critical area(s).

Related NOTAMs:
ORD 06/887 ORD RWY 10L/28R CLSD 1806211501-1806211600
ORD 06/890 ORD AD AP WDI FOR RWY 10L OUT OF SERVICE 1806211547-1807262300
ORD 06/892 ORD NAV ILS RWY 10L OUT OF SERVICE 1806211633-1806222200
ORD 06/893 ORD RWY 10L ALS OUT OF SERVICE 1806211723-1806222359

KORD 211651Z 07011KT 2SM +RA BR OVC006 18/17 A2978 RMK AO2 SLP080 P0013 T01830167=
KORD 211647Z 07010KT 2 1/2SM RA BR OVC006 18/17 A2978 RMK AO2 P0011=
KORD 211551Z 08013KT 3SM -RA BR OVC005 19/17 A2978 RMK AO2 SLP081 P0016 T01890172=
KORD 211543Z 07011KT 3SM -RA BR OVC005 19/18 A2977 RMK AO2 LTG DSNT SE P0015 T01890178=
KORD 211451Z 06012KT 2 1/2SM RA BR OVC006 19/18 A2978 RMK AO2 LTG DSNT E SLP080 P0025 60056 T01890178 58001=
KORD 211434Z 06010KT 2SM RA BR OVC006 19/18 A2978 RMK AO2 LTG DSNT E P0019 T01890178=
KORD 211351Z 06011KT 1 1/2SM +RA BR OVC007 19/18 A2979 RMK AO2 SLP085 P0031 T01890178=
KORD 211259Z 08005KT 1 1/2SM +RA BR OVC005 19/18 A2979 RMK AO2 P0000 T01890178=
KORD 211251Z 07007KT 3SM -RA BR OVC005 19/18 A2979 RMK AO2 RAB40 SLP085 P0000 T01890178=
KORD 211151Z 06008KT 3SM BR OVC006 19/17 A2978 RMK AO2 SLP082 60040 70040 T01890172 10189 20178 58003=
KORD 211051Z 07008KT 3SM BR OVC005 19/17 A2979 RMK AO2 SLP084 T01890172=
KORD 211041Z 07008KT 4SM BR OVC005 19/17 A2979 RMK AO2 T01890172=
KORD 210951Z 06011KT 6SM BR OVC005 18/17 A2978 RMK AO2 DZB0852E26 SLP080 P0000 T01830172=
Incident Facts

Date of incident
Jun 21, 2018


Aircraft Registration

Aircraft Type
Boeing 747-400

ICAO Type Designator

Airport ICAO Code

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