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TABLE 23

SPECIFIC UNSAFE CONDITIONS CONTRIBUTING 
TO CRITICAL SITUATIONS IN AIRLINE FLYING

[[3 columned table]]
Unsafe Conditions | Frequency | Frequency 
--- | --- | ---
A. Weather |   | 244
1. Impairment of flight (cross-winds, downdrafts, gustiness, icing) | 83 |
2. Obstruction to visibility (fog, haze, rain, low ceilings, snow, smoke) | 82 |
3. Danger of damage to aircraft (turbulence, thunderstorms, hail) | 32 |
4. Impairment to ground operations (ice, snow, or rain on runway, snow banks) | 30 |
5. Impairment to radio reception (electrical storms, antenna icing) | 17 |

B. Unsafe Conditions of Airplane |   | 68
1. Engine failure (both actual and simulated) | 52 |
2. Instrument failures | 4 |
3. Lack of standardization of cockpits | 4 |
4. Radio failure | 2 |
5. Hydraulic system failure | 2 |
6. Flat tire | 1 |
7. No oxygen | 1 |
8. Engine fire | 1 |
9. Locked brakes | 1 |

C. Unsafe Conditions of Airport |   | 64
1. Interference by trucks, equipment, other planes | 29 |
2. Runway slippery | 24 |
3. runways too short | 5 |
4. Rough runway | 5 |
5. Poor lighting on airport | 1 |

D. Traffic |   | 42
1. Congested traffic, interference by other planes | 25 |
2. Inadequacy of information from tower or A.T.C. concerning traffic | 14 |
3. Radio ranges inoperative or inadequate | 3 | 

E. Other |   | 11
1. Presence of mountainous terrain | 8 |    
2. Improper loading of airplane | 2 |     
3. Unfamiliar airplane |  1  |    
TOTAL |   | 429   

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