41. In general, an instrument approach is performed if the visibility is poor or if there are low clouds. 42. The airport has published instrument approaches . 43. In such cases, a pilot may execute multiple instrument approaches in a row, with missed approaches between them. 44. Each country maintains their own instrument approach procedures according to International Civil Aviation Organization ( ICAO ) standards. 45. There are no instrument approach procedures. 46. Both pilots had made more than 100 approaches into San Francisco Airport, many of which were instrument approaches . 47. Runway 36 has an ILS approach system, allowing for instrument approaches during times of fog and low ceilings. 48. They operate in all weather conditions and have instrument approaches available for use by pilots in bad weather. 49. Senior Air Force officials here said the inclement weather had forced the pilot to make an instrument approach . 50. The airport is operated by the Government of Ontario, and consists of a gravel runway with published instrument approaches .
