[wakkas]

واعتقد ان وصلنا إلى الارتفاع المطلوب , و لاكن حدثت ظاهرة غريبة اتمنا من احد الإخوان يشرح لي اياها ???

This is Air condensation on the wing due to low pressure on upper surface of the wing , this happens when there is moisture in the air and because of the reason mentioned above.

I hope iam right, let the experience guys help you more in this.

Thanks and regards
Wakkas. A&P Techn